Powerpivot for sharepoint error: Unable to refresh data for a data connection in the workbook

Question

Hello,
 I have three errors when i try to use a simple powerpivot workbook published in sharepoint: (nothing on google has help me..)
1-Unable to refresh data for a data connection in the workbook.
Try again or contact your system administrator. The following connections failed to refresh:
PowerPivot Data
2-The embedded PowerPivot data in the workbook cannot be loaded due to a version mismatch
3-01/21/2012 17:26:47.08  w3wp.exe (0x1950)                        0x0AD0 Excel Services Application     Excel
Calculation Services     bccc Medium   Session.HandleTrimmedWorkbookReloading: userOperation ApplySlicerSelectionOperation requires BaseWorkbook: "http://crm2011:2020/Marketing%20Reports/test2_excel32bits.xlsx"
[0x409] [Saturday, 21 January 2012 09:40:18] [BaseWB ID: 2] to be untrimmed if it is currently trimmed. The workbook is currently NOT trimmed. fb614a65-e398-4b97-a98d-fb7b23eab39f
01/21/2012 17:26:47.08  w3wp.exe (0x1950)                        0x0AD0 Excel Services Application     Excel Calculation
Services     f1va Medium   CWorkbookWrapper::CWorkbookWrapper: Created with ID=4 fb614a65-e398-4b97-a98d-fb7b23eab39f
01/21/2012 17:26:47.09  w3wp.exe (0x1950)                        0x0AD0 Excel Services Application     Excel Calculation
Services     eq3r Medium   ConnectionRequest.ConnectionRequest: New connection request. SessionId=1.V21.4PI+fCwIq52LH++nOoMzs90.5.en-US5.en-US73.-0060#0000-10-00-05T03:00:00:0000#+0000#0000-03-00-05T02:00:00:0000#-006036.bfceb31b-7122-46ca-9e2a-ae52cefcfcaf1.N,
WorkbookVersion=ConnectionInfo.WorkbookVersion: Uri=http://crm2011:2020/Marketing Reports/test2_excel32bits.xlsx, Version=Saturday, 21 January 2012 09:40:18 fb614a65-e398-4b97-a98d-fb7b23eab39f
01/21/2012 17:26:47.12  w3wp.exe (0x1950)                        0x0AD0 Excel Services Application     Excel Calculation
Services     aysl Medium   Succeeded to initialize a chart. fb614a65-e398-4b97-a98d-fb7b23eab39f
01/21/2012 17:26:47.12  w3wp.exe (0x1950)                        0x0AD0 Excel Services Application     Excel Calculation
Services     8xk9 Medium   ExternalSource.ExecuteOperation: We exhausted all available connection information. Exception: Microsoft.Office.Excel.Server.CalculationServer.Interop.ConnectionInfoException: Exception of type
'Microsoft.Office.Excel.Server.CalculationServer.Interop.ConnectionInfoException' was thrown.     at Microsoft.Office.Excel.Server.CalculationServer.ConnectionInfoManager.GetConnectionInfo(Request request, String externalSourceName, Int32
externalSourceIndex, Boolean& shouldReportFailure)     at Microsoft.Office.Excel.Server.CalculationServer.ExternalSource.ExecuteOperation(Request request, ExternalSourceStateInfo externalSourceStateInfo, ExternalSourceStateInfo prevExternalSourceStateInfo,
Int32 index, ConnectionInfoManager connectionInfoManager, ExternalDataScenario scenario, DataOperation dataOpe... fb614a65-e398-4b97-a98d-fb7b23eab39f
01/21/2012 17:26:47.12* w3wp.exe (0x1950)                        0x0AD0 Excel Services Application     Excel Calculation
Services     8xk9 Medium   ...ration, Boolean verifyPreOperationConnection), Data Connection Name: PowerPivot Data, SessionId: 1.V21.4PI+fCwIq52LH++nOoMzs90.5.en-US5.en-US73.-0060#0000-10-00-05T03:00:00:0000#+0000#0000-03-00-05T02:00:00:0000#-006036.bfceb31b-7122-46ca-9e2a-ae52cefcfcaf1.N,
UserId: 0#.w|contoso\manager fb614a65-e398-4b97-a98d-fb7b23eab39f
My server and client olap versions are the same: MSOLAP.5, i used sql server 2008 R2 SP1 and sharepoint 2010 SP1 and reboot or iisreset have no effect
Thanks in advance for your help

Answer 1

Hello Challen Fu
I would be so grateful if you could please help me out
I have been trying to find a solution to the same error message
In my case, the power pivot reports were working before on a regular team  site , but then two things changed:
a)  I  created a toplevel site using the BI Center template. Now I am using a Business Intelligence template , created a power pivot gallery library and uploaded a few powerpivot reports
b)  On the  backend, the database instance was upgrated to SQL Server 2012 
     Front end Server VDSP01  remains  SQL Server 2008 R 2 where Sharepoint 2010  was installed as a FARM  
Now, the reports will display in sharepoing however they will not refresh. the error message i get is the same.
 Scenario recap:
a- Server VDSP01  uses SQL Server 2008 R 2 where Sharepoint 2010  was installed as a FARM
b- On the back end,  the database instance name was replaced with SQL 2012 Server:
           from SQL Server 2008 R 2 (instance DBDEV-COTS\COTS)
           to     SQL Server 2012 ( instance VTSQL01\COTS)
c-  I was told that:
     From VDSP01, they ran
CliConfg.exe   to create SQL Server Alias :
       where    BEFORE: vdsharepoint -->  DBDEV-COTS\COTS
            and  AFTER    : vdsharepoint -->  VTSQL01\COTS
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wanda larangeira