Redownload - 'An unknown error has occurred'

I downloaded a couple of books when I first got iBooks and have since read & deleted them, knowing they'd be sat in my purchases history in case I ever wanted to redownload them in the future.
When I do try and redownload them the download starts (screen goes back to library and the icon for the book appears) before I get 'An unknown error has occurred'
Now I'm stuck with books in my purchases which I am unable to redownload. My purchase list now has a load of unusable links making things a bit of a mess. I'd happily just delete these items off my purchase list if that was an option, but it makes me even more reluctant to buy from the store in future.
Has anyone else come across this, I've tried uninstalling/reinstalling with no success - any advice would be much appreciated!

mrmarkstephens wrote:
... knowing they'd be sat in my purchases history in case I ever wanted to redownload them in the future.
what made you think that ? except for purchased apps, you are entitled to one download only. click here for more information.
you might want to try what Zevoneer suggested in another thread:
You could try contacting the iTunes Music Store Customer Service and you might be able to persuade them to sanction a second free download. There have been occasional reports in the iTunes forum of this happening, however just be aware that they are not under any obligation to do so. If you click on this link you'll be able to email your query: iTMS Customer Service
You might also want to check out these pages for future reference:
How to back up your media in iTunes
Back up your iTunes library by copying to an external hard drive
good luck !
JGG

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Project Server 2010 - Project Center: An unknown error has occurred

Hi,
We have an issue where project center is throwing 'An unknown error has occurred' error message. Searching the ULS logs provides this;
12/01/2011 11:48:11.53 w3wp.exe (0x1A98)                       0x15A0 SharePoint Foundation
General                       90hv Unexpected Detected use of SPRequest for previously closed SPWeb object. Please close
SPWeb objects when you are done with all objects obtained from them, but not before. Stack trace:    at Microsoft.SharePoint.SPWeb.get_CurrentUser()     at Microsoft.Office.Project.PWA.PJContext.get_RegionalSettings()
at Microsoft.Office.Project.PWA.PJContext.get_LocaleCulture()     at Microsoft.Office.Project.PWA.WCFContext.AuthenticateUser(Message message, WCFContext& wcfContext, String userName, Boolean isWindowsUser)     at
Microsoft.Office.Project.PWA.WCFContext.GetContext(Message message, String userName, Boolean isWindowsUser, Boolean newCookie, Uri originalTargetUri)     at Microsoft.Office.Project.Server.ProjectServerRouter.Microsoft.Office.Project.Server.IProjectServerRouter.ProcessMessage(Message
me... 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.53* w3wp.exe (0x1A98)                       0x15A0 SharePoint Foundation
General                       90hv Unexpected ...ssage)     at SyncInvokeProcessMessage(Object , Object[]
, Object[] )     at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)     at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc&
rpc)     at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)     at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)     at System.ServiceModel.Dispatcher.ChannelHandler.DispatchAndReleasePump(RequestContext request, Boolean cleanThread, OperationContext currentOperationContext)
at System.ServiceModel.Dispatcher.ChannelHandler.HandleRequest(RequestConte... 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.53* w3wp.exe (0x1A98)                       0x15A0 SharePoint Foundation
General                       90hv Unexpected ...xt request, OperationContext currentOperationContext)
at System.ServiceModel.Dispatcher.ChannelHandler.AsyncMessagePump(IAsyncResult result)     at System.ServiceModel.Diagnostics.Utility.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)     at System.ServiceModel.AsyncResult.Complete(Boolean
completedSynchronously)     at System.ServiceModel.Channels.InputQueue`1.AsyncQueueReader.Set(Item item)     at System.ServiceModel.Channels.InputQueue`1.EnqueueAndDispatch(Item item, Boolean canDispatchOnThisThread)
at System.ServiceModel.Channels.InputQueue`1.EnqueueAndDispatch(T item, ItemDequeuedCallback dequeuedCallback, Boolean canDispatchOnThisThread)     at System.ServiceModel.Channels.InputQueueChannel`1.EnqueueAndDispatch(TDisposable item,
ItemDequeuedCallback dequeuedCallback,... 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.53* w3wp.exe (0x1A98)                       0x15A0 SharePoint Foundation
General                       90hv Unexpected ... Boolean canDispatchOnThisThread)     at System.ServiceModel.Channels.SingletonChannelAcceptor`3.Enqueue(QueueItemType
item, ItemDequeuedCallback dequeuedCallback, Boolean canDispatchOnThisThread)     at System.ServiceModel.Channels.SingletonChannelAcceptor`3.Enqueue(QueueItemType item, ItemDequeuedCallback dequeuedCallback)     at System.ServiceModel.Channels.HttpChannelListener.HttpContextReceived(HttpRequestContext
context, ItemDequeuedCallback callback)     at System.ServiceModel.Activation.HostedHttpTransportManager.HttpContextReceived(HostedHttpRequestAsyncResult result)     at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.BeginRequest()
at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequest(Object state)     at System.ServiceModel.PartialTrus... 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.53* w3wp.exe (0x1A98)                       0x15A0 SharePoint Foundation
General                       90hv Unexpected ...tHelpers.PartialTrustInvoke(ContextCallback callback, Object state)
at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequestWithFlow(Object state)     at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.WorkItem.Invoke2()     at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.WorkItem.Invoke()
at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.ProcessCallbacks()     at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.CompletionCallback(Object state)     at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.ScheduledOverlapped.IOCallback(UInt32
errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)     at System.ServiceModel.Diagnostics.Utility.IOCompletionThunk.UnhandledExceptionFrame(UIn... 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.53* w3wp.exe (0x1A98)                       0x15A0 SharePoint Foundation
General                       90hv Unexpected ...t32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped)
at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP) 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.54 w3wp.exe (0x1A98)                       0x15A0 SharePoint Foundation
Topology                      e5mc Medium WcfSendRequest: RemoteAddress: 'http://servername:32843/f78ead39833941f4911623b393bd511f/PSI/PWA.svc'
Channel: 'System.ServiceModel.Channels.IRequestChannel' Action: 'http://schemas.microsoft.com/office/project/server/webservices/PWA/ProjectGetProjectCenterProjectsForGridJson' MessageId: 'urn:uuid:05d10069-fa3b-4f09-8a7b-1ba900608c5a' 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.56 w3wp.exe (0x05D4)                       0x1EF4 SharePoint Foundation
Topology                      e5mb Medium WcfReceiveRequest: LocalAddress: 'http://servername.domainname:32843/f78ead39833941f4911623b393bd511f/PSI/PWA.svc'
Channel: 'System.ServiceModel.Channels.ServiceChannel' Action: 'http://schemas.microsoft.com/office/project/server/webservices/PWA/ProjectGetProjectCenterProjectsForGridJson' MessageId: 'urn:uuid:05d10069-fa3b-4f09-8a7b-1ba900608c5a' 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.56 w3wp.exe (0x05D4)                       0x1EF4 SharePoint Foundation
Monitoring                    nasq Medium Entering monitored scope (ExecuteWcfServerOperation) 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.61 w3wp.exe (0x05D4)                       0x1EF4 Project Server
General                       0000 Exception Exception occurred in method Microsoft.Office.Project.Server.BusinessLayer.Project.ProjectGetProjectCenterProjectsForGridJson
Microsoft.Office.Project.Server.DataAccessLayer.FilterDal+FilterException: Error during filter query execution.   Query:     declare @ResUid UniqueIdentifier; set @ResUid = 51924808-f1b5-45b1-81d6-01f4e314df4b; declare @PermUid
UniqueIdentifier; set @PermUid = a120a079-75bc-4f0f-b376-3fb0ae9ac940; declare @ViewUid UniqueIdentifier; set @ViewUid = 63d3499e-df27-401c-af58-ebb9607beae8; declare @P0 Int; set @P0 = 5;    SET NOCOUNT ON    SELECT
T.PROJ_UID   INTO #T0   FROM dbo.MSP_PROJECTS AS P      INNER JOIN dbo.MSP_TASKS AS T ON T.PROJ_UID = P.PROJ_UID     INNER JOIN dbo.MSP_RESOURCES AS R ON R.RES_UID = P.WRES_UID
LEFT JOIN dbo.MSP_WORKFLOW_STATUS AS WFS... 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.61* w3wp.exe (0x05D4)                       0x1EF4 Project Server
General                       0000 Exception ...TS ON WFSTS.PROJ_UID = P.PROJ_UID     INNER JOIN dbo.MSP_WEB_FN_SEC_GetAllProjectsResCanViewByViewID(@ResUid,
@PermUid, @ViewUid, 3) AS perm ON perm.PROJ_UID = T.PROJ_UID WHERE T.TASK_OPTINDX = 1.0    AND (ISNULL(WFSTS.STAGE_STATUS,-1) IN (-1, 1,2,3,5,6))   AND ((P.PROJ_TYPE <> @P0) OR (P.PROJ_TYPE IS NULL)) CREATE CLUSTERED
INDEX PK_#T0 ON #T0 (PROJ_UID)    SET NOCOUNT OFF    SELECT      T.PROJ_UID ,      P.PROJ_NAME ,      T.TASK_START_DATE ,
T.TASK_FINISH_DATE ,      T.TASK_PCT_COMP ,      T.TASK_WORK ,      T.TASK_DUR ,      R.RES_NAME ,      P.WPROJ_LAST_PUB ,
P.PROJ_OPT_MINUTES_PER_DAY ,      P.PROJ_OPT_MINUTES_PER_WEEK ,      P.PROJ_OPT_DAYS_PER_MONTH ,      T.TASK_SUMMARY_PROGRESS_DATE ,      T.TASK_IS_MILESTONE
,      dbo.MSP_FN_HYPERLINK_HREF(T.TASK_HYPERLINK_ADDRESS,... 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.61* w3wp.exe (0x05D4)                       0x1EF4 Project Server
General                       0000 Exception ... T.TASK_HYPERLINK_SUB_ADDRESS) AS TASK_HYPERLINK_HREF ,
T.TASK_OUTLINE_LEVEL ,      P.PROJ_TYPE ,      T.TASK_DUR_FMT ,      P.WSTS_SERVER_UID ,      P.PROJ_OPT_CURRENCY_CODE ,      P.PROJ_ACTIVE_RISK_COUNT
,      P.PROJ_ACTIVE_ISSUE_COUNT ,      P.PROJ_TOTAL_DOC_COUNT ,      WOB.WOBJ_ISSUE_REF_CNT ,      WOB.WOBJ_RISK_REF_CNT ,      WOB.WOBJ_DOC_REF_CNT
,      PJSYNC.SYNC_WSS_LIST_UID ,      T.TASK_COMPLETE_THROUGH ,      (CASE WHEN T.TASK_UID=T.TASK_PARENT_UID THEN 1 ELSE 0 END) AS TASK_IS_PROJECT_SUMMARY   FROM dbo.MSP_PROJECTS
AS P      INNER JOIN dbo.MSP_TASKS AS T ON T.PROJ_UID = P.PROJ_UID     INNER JOIN dbo.MSP_RESOURCES AS R ON R.RES_UID = P.WRES_UID     LEFT JOIN dbo.MSP_WORKFLOW_STATUS AS WFSTS ON WFSTS.PROJ_UID
= P.PROJ_UID     INNER JOIN #T0 AS keys ON keys.PROJ_UID = P.P... 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.61* w3wp.exe (0x05D4)                       0x1EF4 Project Server
General                       0000 Exception ...ROJ_UID     LEFT JOIN (SELECT WOBJ_PROJ_UID as PROJ_UID,[4]
as WOBJ_ISSUE_REF_CNT, [5] as WOBJ_RISK_REF_CNT, [3] as WOBJ_DOC_REF_CNT               FROM (               SELECT WOBJ_TYPE,
WOBJ_PROJ_UID                FROM MSP_WEB_OBJECTS WHERE WOBJ_TASK_UID='00000000-0000-0000-0000-000000000000') pwob
PIVOT (COUNT(WOBJ_TYPE) FOR WOBJ_TYPE in([3] ,[4],[5])) AS pvt) AS WOB ON WOB.PROJ_UID = P.PROJ_UID     LEFT JOIN dbo.MSP_SYNC_PROJECT_SETTINGS AS PJSYNC ON PJSYNC.PROJ_UID = P.PROJ_UID WHERE T.TASK_OPTINDX = 1.0
AND (ISNULL(WFSTS.STAGE_STATUS,-1) IN (-1, 1,2,3,5,6))      DROP TABLE #T0;     ---> System.Data.ConstraintException: Failed to enable constraints. One or more rows contain values violating non-null, unique,
or foreign-key constraints.     at System.Data.DataSet.Enable... 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.61* w3wp.exe (0x05D4)                       0x1EF4 Project Server
General                       0000 Exception ...Constraints()     at System.Data.DataSet.set_EnforceConstraints(Boolean
value)     at Microsoft.Office.Project.Server.DataAccessLayer.DAL.SubDal.FillTypedDataSet(Boolean allowCache, DataSet typedDataSet, String[] tables, SqlCommand sqlCommand, Boolean enforceConstraints)     at Microsoft.Office.Project.Server.DataAccessLayer.DAL.SubDal.FillTypedDataSet(DataSet
typedDataSet, String[] tables, SqlCommand sqlCommand, Boolean enforceConstraints)     at Microsoft.Office.Project.Server.DataAccessLayer.FilterDal.FillDataSet(QueryState queryState)     --- End of inner exception stack
trace ---     at Microsoft.Office.Project.Server.DataAccessLayer.FilterDal.FillDataSet(QueryState queryState)     at Microsoft.Office.Project.Server.Utility.FilterDalQueryInfo.Query()     at Microsoft.Office.Project.Se... 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.61* w3wp.exe (0x05D4)                       0x1EF4 Project Server
General                       0000 Exception ...rver.BusinessLayer.Project.ProjectQueryInfo.Query()
at Microsoft.Office.Project.Server.BusinessLayer.Project.ProjectCenterQueryInfo.Query()     at Microsoft.Office.Project.Server.Utility.JsGridPopulationManager.InitializeSerializer(TableQueryInfo tableInfo, OrderInfo orderInfo, SliceInfo
sliceInfo, Guid groupSchemeUid, Nullable`1 ganttSchemeUid, Boolean serializeStyles, Func`1 getChanges, Boolean serializeUnfilteredHierarchy, Boolean serializeLookupTableInfo, Boolean showTimeWithDates, String rowFilter)     at Microsoft.Office.Project.Server.Utility.JsGridPopulationManager.InitializeSerializer(TableQueryInfo
tableInfo, ViewPropertyGroup properties, JsGridSerializerArguments gridSerializerArgs, Func`1 getChanges)     at Microsoft.Office.Project.Server.BusinessLayer.Project.GetProjectCen... 18800f49-4909-4e4d-8130-6ead4d554598
12/01/2011 11:48:11.61* w3wp.exe (0x05D4)                       0x1EF4 Project Server
General                       0000 Exception ...terProjectsForGridJson(JsGridSerializerArguments gridSerializerArgs, Guid viewUid,
Int32 store, Boolean showInsertedProjects, Boolean clearPersistedProperties)     at Microsoft.Office.Project.Server.Wcf.Implementation.PWAImpl.ProjectGetProjectCenterProjectsForGridJson(JsGridSerializerArguments gridSerializerArgs, Guid
viewUid, Int32 store, Boolean showInsertedProjects, Boolean clearPersistedProperties) 18800f49-4909-4e4d-8130-6ead4d554598
I have searched the internet but most similar issues revolve around the resource center. I did find one person who just backed up the databases and provisioned a new site with success, but this has not worked. I am using the farm admin account, but all users
get this issue.
Any one got any ideas?
Rob Hardy

Bit further now.
It seems one of the project won't publish, and produces this error;
<?xml version="1.0" encoding="utf-16"?>
<errinfo>
<general>
  <class name="ActiveCacheQueuedMessageExecutionError">
   <error id="12005" name="ActiveCacheQueuedMessageExecutionError" uid="53d5e6c5-be41-47c8-b336-2e472b99d142" error="System.Data.SqlClient.SqlException: Violation of PRIMARY KEY constraint 'PK_MSP_PROJECT_RESOURCES'. Cannot insert duplicate
key in object 'dbo.MSP_PROJECT_RESOURCES'.
Violation of PRIMARY KEY constraint 'PK_MSP_PROJECT_RESOURCES'. Cannot insert duplicate key in object 'dbo.MSP_PROJECT_RESOURCES'.
The statement has been terminated.
The statement has been
terminated.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)

at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader
ds, RunBehavior runBehavior, String resetOptionsString)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior
cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe)

at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   at Microsoft.Office.Project.Server.DataAccessLayer.DAL.SubDal.ExecuteStoredProcedureNoResult(String storedProcedureName, SqlParameter[] parameters)
   at Microsoft.Office.Project.Server.DataAccessLayer.WinProjDal.ExecuteStoredProcedure(String
spName, SqlParameter[] parameters)
   at Microsoft.Office.Project.Server.BusinessLayer.WinProjUtility.WinProjUtility.ExecuteP12QueueableSPCommand(WinProjTraceContext wpTraceContext, DataStoreEnum store, P12QueueableSPCommand command, Boolean
retry, Boolean useTransaction)
   at Microsoft.Office.Project.Server.BusinessLayer.WinProjUtility.WinProjQueueMessageDispatcher.DispatchMessage(ACMessage acMessage, Message msg, Group messageGroup, JobTicket jobTicket, MessageContext mContext)"/>
  </class>
  <class name="Queue">
   <error id="26000" name="GeneralQueueJobFailed" uid="65e11595-30af-4be7-a9d0-ec767c880cc7" JobUID="c348fb86-d807-4b06-abaa-81fcbcbc94f3" ComputerName="SERVERNAME" GroupType="ACProjectSave" MessageType="Byte[]" MessageId="8" Stage=""/>
  </class>
</general>
</errinfo>
Anyone seen this? If I delete this project the project center loads. Obvisouly I don't want to do that though!
Rob Hardy

Project Server 2010 Task page - An unknown error has occurred

Hi All,
I have searched inside the forum for similar problems but i didn't find any solution.
We have Project Server 2010 with December CU installed and
we are
experiencing
a serious
problem with two enterprise resources.
They can login to pwa succesfully but when they enter in the Task page the following error is raised:
An unknown error has occurred
There are no errors reported in the event viewer while in the ULS Log I found only this entry but i don't know if it's related with this issue:
Detected use of SPRequest for previously closed SPWeb object. Please close SPWeb objects when you are done with all objects obtained from them, but not before. Stack trace:
at Microsoft.SharePoint.SPWeb.get_CurrentUser()
at Microsoft.Office.Project.PWA.PJContext.get_RegionalSettings()
at Microsoft.Office.Project.PWA.PJContext.get_LocaleCulture()
at Microsoft.Office.Project.PWA.WCFContext.AuthenticateUser(Message message, WCFContext& wcfContext, String userName, Boolean isWindowsUser)
at Microsoft.Office.Project.PWA.WCFContext.GetContext(Message message, String userName, Boolean isWindowsUser, Boolean newCookie, Uri originalTargetUri)
at Microsoft.Office.Project.Server.ProjectServerRouter.Microsoft.Office.Project.Server.IProjectServerRouter.ProcessMessage(Message message)
at SyncInvokeProcessMessage(Object , Object[] , Object[] )
at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)
at System.ServiceModel.Dispatcher.ChannelHandler.DispatchAndReleasePump(RequestContext request, Boolean cleanThread, OperationContext currentOperationContext)
at System.ServiceModel.Dispatcher.ChannelHandler.HandleRequest(RequestContext request, OperationContext currentOperationContext)
at System.ServiceModel.Dispatcher.ChannelHandler.AsyncMessagePump(IAsyncResult result)
at System.ServiceModel.Diagnostics.Utility.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
at System.ServiceModel.AsyncResult.Complete(Boolean completedSynchronously)
at System.ServiceModel.Channels.InputQueue`1.AsyncQueueReader.Set(Item item)
at System.ServiceModel.Channels.InputQueue`1.EnqueueAndDispatch(Item item, Boolean canDispatchOnThisThread)
at System.ServiceModel.Channels.InputQueue`1.EnqueueAndDispatch(T item, ItemDequeuedCallback dequeuedCallback, Boolean canDispatchOnThisThread)
at System.ServiceModel.Channels.InputQueueChannel`1.EnqueueAndDispatch(TDisposable item, ItemDequeuedCallback dequeuedCallback, Boolean canDispatchOnThisThread)
at System.ServiceModel.Channels.SingletonChannelAcceptor`3.Enqueue(QueueItemType item, ItemDequeuedCallback dequeuedCallback, Boolean canDispatchOnThisThread)
at System.ServiceModel.Channels.SingletonChannelAcceptor`3.Enqueue(QueueItemType item, ItemDequeuedCallback dequeuedCallback)
at System.ServiceModel.Channels.HttpChannelListener.HttpContextReceived(HttpRequestContext context, ItemDequeuedCallback callback)
at System.ServiceModel.Activation.HostedHttpTransportManager.HttpContextReceived(HostedHttpRequestAsyncResult result)
at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.BeginRequest()
at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequest(Object state)
at System.ServiceModel.PartialTrustHelpers.PartialTrustInvoke(ContextCallback callback, Object state)
at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequestWithFlow(Object state)
at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.WorkItem.Invoke2()
at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.WorkItem.Invoke()
at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.ProcessCallbacks()
at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.CompletionCallback(Object state)
at System.ServiceModel.Channels.IOThreadScheduler.CriticalHelper.ScheduledOverlapped.IOCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
at System.ServiceModel.Diagnostics.Utility.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped)
at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)
It's not a task related errors because i have alredy done an analysis of the resorce's assignments.
I have also verified IIS authentication settings as described in this
post but all had been alredy correctly configured.
We have a farm installation with two physical server:
Application Server with Windows 2008 R2, SharePoint 2010 Enterprise, Project Server 2010
Database Server with Windows 2008 R2 and SQL Server 2008 SP2
Any help would be greatly appreciated!
Thanks in advance.
Raffaele

Hi,
I faced exactly the same problem: some resources try to connect to My Tasks, and get an Unknown error. No error message in ULS or Eventlog.
I hope I solved the problem, and want to share the experience here.
First, by reading this article,
http://www.projectserverexperts.com/ProjectServerFAQKnowledgeBase/Unknown%20Error%20My%20Tasks%20Page.aspx: even if the SQL Query returns me no records, it gives me the idea to delete (unpublish) some tasks (i managed to identify some tasks which raised
the problem, by assigning a test account on them, and see that the pb happened).
So I decided to delete my project from the Published Database (and keep it in the Draft of course). Than in Project Pro, I opened and Published: the problem seem to be solved.
I don't know the root cause of the pb: maybe some SQL data were corrupted for an unknown reason.
Hope it could help some one ! Don't hesitate to give feedback if you solved this pb with this solution, or workaround.
Sylvain

'The itunes application could not be opened. an unknown error has occurred'

Could someone please help me, i recently had to restore my comouter to a previous date and due to this i had to reinstall a few programs along the way. Now unfortunatley itunes is not being co-operative, ive uninstalled it and then reinstalled with no luck. Each time i get to the end of the installation and tries to open up i get this message 'The itunes application could not be opened. an unknown error has occurred (-200)'
I would appreciate any help!
thank you

Could someone please help me, i recently had to
restore my comouter to a previous date and due to
this i had to reinstall a few programs along the way.
Now unfortunatley itunes is not being co-operative,
ive uninstalled it and then reinstalled with no
luck. Each time i get to the end of the installation
and tries to open up i get this message 'The itunes
application could not be opened. an unknown error
has occurred (-200)'
I would appreciate any help!
thank you
Ah not to worry i percievierd and managed to figure it out. Thanks to anyone that may have looked at my question!!

I got "Invalid link" when I to reset my security questions from rescue email. Moreover when I log in into my Apple ID and click on Passwords and Security I'm thrown out with the message "An unknown error has occurred".

Here is my problem:
Need to change my email with the one that currently I'm using for rescue
Planed to change first the rescue email with a new one.
But:
I Forgot the security questions
Followed the reset security questions instructions.
Got the email on the rescue address but The link I've got on my rescue email to reset my security questions is invalid. By now the 3 hour window for the validity of the link is gone.
If I go via Apple ID, I login successfully but when I select Security I'm thrown back into Manage your Apple ID screen that displays now as well this message "An unknown error has occurred"
Tried several times, the same again and again.
On top of the long hours on the forums I spent 20 minutes over the phone with the US support on international charge, eventually I hanged up while waiting too long for the 3 rd expert but got an email later on indicating to clear my browser history and try again, which didn't work. Case number 519598448. Used my laptop with IE and my iPad, same result.

This problem now appears for me too.
When using iforgot.apple.com email-verification clicking the reset link results in the "Invalid Link" error.
The error, that caused me to do this (password failing to verify against iCloud) has vanished since though.

Corrupted/Locked out apple ID "An Unknown Error has occurred" logging into support?

I was forced to use a different apple id to log into this support community because all attempts from different devices and browsers using another ID have ended up at the password prompt with "An unknown error has occurred" at the community login screen. The ID can still be "manged" and appears to be able to make purchases from the iTunes Store over the internet. A phone incident case number 388249960 was opened and I spent over an hour on the phone with this problem. The ID in question was set up more than two years ago to help with my wife's iPad 1 which we paid 800 plus for,,, all the storage and bells and whistles. Recently she started using the iTunes store to purchase and download television series and we got in trouble because her directories were filling the c:drive on a Vista Business computer she normally uses. Before starting to deal with the problem of storage, I tried to make sure everything was up to date and downloaded/installed the latest iTunes 11.0,1,, to her machine. I already had it on another machine running Windows 7 and two older Windows XP machines. All of them were "tested" for home networking to our Apple TV so that I could go to the TV and find a computer which could be used as a source for streaming music, videos, etc., etc. all based on her ID. As of this writing, I believe all of that functionality still exists, but, when I navigate to support and try to log in using her ID and password, I get re-prompted for the password and then "Locked Out" when "An Unknown Error Has Occurred" pops up above the login via the web site.
I am writing this after much agony and travial via an obsolete instance of Windows Explorer running on Windows XP Home Premium on an old portable using a newly created Apple ID which does not appear to have the same problems logging into the support community. Can anyone out there help me?
I have gone to war with Comcast's "free" security enhancement software "Constant Guard" believing that it might be the source. This machine had it installed at one time and has had it completely removed, but... it still experiences the error when my wife's ID is used.
The issue may be related to the recently added requirement for secuity questions and recovery email addresses which I tried to address for her ID and inadvertently ran into conflict/problem with using certain other email addresses with her ID. Perhaps something is corrupted in the database for her ID, or related to problems with support for esoteric things like Microsoft's .NET enhancements which I have long been using on my computers, or possibly Constant Guard "started" the problem because it was probably running when account security data was being updated via the Apple web site? I tried to get information about what I thought was the "recovery email address" associated with her account and was told by Apple Web sites that it was "in use" as an apple ID and could not be used as her recovery address. When I called trying to confirm that this ID was "mine" I was able to provide one of two security clearance pieces of data, but not enough information to get the support person to straighten things out for me. I ended up creating "yet another" ID just to get clear of the mess.
I made a suggestion to one of the folks I spoke with that an improvement to the functionality of apple ID's would be to support "consolidation" of accounts so that if several different Apple devices had been registered with different ID's and they all belonged to the same user(s) that a "common ID" could be created.
I'm reluctant to post apple ID's in a public support forum, and would prefer to deal with this by private email. or phone.
Message was edited by: [email protected]

[email protected] wrote:
I'm reluctant to post apple ID's in a public support forum, and would prefer to deal with this by private email. or phone.
Then contact Apple directly.
This is a user to user technical support forum. No one here has access to manage Apple ID's other than their own.
There is no Apple presence here.

The iPhone "iPhone" could not be restored. An unknown error has occured (3). How do I fix this?

I had a problem with my iPhone 5 connecting to my service provider (verizon) and also to the internet just minutes after I had used the internet to browse before work this morning. I tried soft reset, hard reset, and connecting to my computer, but nothing worked to get it back to normal. I decided to do a system wipe and restore it as well, but I get that error: "The iPhone "iPhone" could not be restored. An unknown error has occured (3)." I googled that and searched for literally 7 hours without any luck. Any and all help is appreciated. Thanks!

This has just happened to me today. I have an iphone 5 on Verizon. I was using the internet on the device normally when it started. It couldn't access any online data even though it had 4 bars of service and LTE. I restarted it and it would be stuck "Searching for network". I tried wiping the phone with no luck. It gets stuck at around 99% of the firmware restore process and hangs there for about 25 minutes before itunes gives me the error described above. I tried the recover-mode restore with the same results.
I need a working phone ASAP, this is extremely frustrating!

"The iPod cannot be synced. An unknown error has occured (-48)"

*The iPod "Ash" cannot be synced. An unknown error has occured (-48)*
Has anyone else had this pop up to themselves or does anyone know how to get anywhere on getting it fixed.
When I try to upload my iPod onto my iTunes, once it gets recognized that pops up and it won't progress anymore. I've tried the Five R's, which haven't helped me and it has also screwed up my album covers, but that is the least of my worries.
If anyone knows how to help me out, that would be very appreciated.

WHat kind of iPod? Seen this?
http://support.apple.com/kb/TS1275
You might try changing your iPod drive letter to something further down in the alphabet, directions are at the end of this article:
http://docs.info.apple.com/article.html?artnum=93499

MS Project 2010 - An unknown error has occurred while syncing to a SharePoint site.

Dear all,
I encountered a generic error when using MS Project 2010 to sync with our SharePoint 2013 on-premise. I want to clarify is it default behaviour or a bug.
When I start MS Project 2010 professional from new -> sync to Sharepoint by type in URL and the list name. I can create a new project list successfully. I have verified the tasks are sync to the Sharepoint and I am able to see them listed on site.
After sync, I save the Ms Project document to local computer. Named test1.mpp. Then I close MS Project. Then open test1.mpp again and then sync immediately. This time an error show up:
An unknown error has occurred while syncing to a SharePoint site. Ensure the SharePoint site is running and try again
Since I didn't add anything to the mpp file, I believe it doesn't contain any invalid data blocking the sync. What would be the problem? Thanks.
Mark

No, I didn't. I just fill the site path like:
http://sharepoint.com/sites/Project/
and then the List field:
ProjectA
I want to clarify the sequence should be:
After sync, I save the Ms Project document to local computer. Named test1.mpp. Then I close MS Project. Then open test1.mpp again and then sync immediately. Then error occur.

Ipod cannot be updated, an unknown error has occurred. (-48)

I'm at the end of my tether right now. I updated iTunes to the newest version, then updated my iPod. Now I'm getting the error message "Ipod cannot be updated, an unknown error has occurred. (-48)". I've searched the site and other forums and I can't find anyone with that same message who can help me. I've tried installing an older version of iTunes but I can't use it because my iPod has been updated to work with the newest one. I've uninstalled and reinstalled iTunes, nothing helped.
So my questions are:
1) Any way I can uninstall the update I did for my iPod? That is, so it is compatible with older versions again.
2) What could be causing this message?
3) Is there an e-mail address for apple, who seem wholly uninterested in what happens with their product once the £235 has been paid for it?
Any help is appreciated.

Interesting, that error code doesn't seem to appear on the iPod support pages. Since it's saying "The iPod cannot be updated" it sounds like it's indicating there's a problem with the iPod... although with "unknown error" it's hard to say for sure. My recommendation would be that you try restoring your iPod, and then giving it another go. If you're uncertain about the restore process, take a look at this article, it should answer your questions.
http://docs.info.apple.com/article.html?artnum=60983
Once you restore it, try updating it again in iTunes. If you have any more problems or questions, feel free to reply, and I'll see what I can do to help.
Best wishes!
CG

Redownload - 'An unknown error has occurred'

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