ERROR: TF246021: An error occurred while processing your request.

Question

Since last week the CI build on our integration branch fails when setting the label for the branch, I tried to create a new (default) build definition, which fails with the same error. Any other branch can build successful.  We get the following error:
Exception Message: TF246021: An error occurred while processing your request.
Technical information (for administrator):
SQL Server Error: 2601 (type VersionControlException)
Exception Stack Trace: 
Server stack trace: 
   at Microsoft.TeamFoundation.Client.Channels.TfsHttpClientBase.HandleReply(TfsClientOperation operation, TfsMessage message, Object[]& outputs)
   at Microsoft.TeamFoundation.VersionControl.Client.Repository5.LabelItem(String workspaceName, String workspaceOwner, VersionControlLabel label, LabelItemSpec[] labelSpecs, LabelChildOption children, Int32 maxClientPathLength, Failure[]& failures)
   at Microsoft.TeamFoundation.VersionControl.Client.WebServiceLayer.LabelItem(String workspaceName, String workspaceOwner, VersionControlLabel label, LabelItemSpec[] labelSpecs, LabelChildOption children, Failure[]& failures)
   at Microsoft.TeamFoundation.VersionControl.Client.VersionControlServer.CreateLabel(VersionControlLabel label, LabelItemSpec[] itemSpecs, LabelChildOption options, Failure[]& failures)
   at Microsoft.TeamFoundation.Build.Workflow.Activities.TfLabel.TfLabelInternal.RunCommand(VersionControlScope versionControlScope, String nonFatalError, VersionControlLabel label, IEnumerable`1 items, LabelChildOption childOption)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.AsyncProcessMessage(IMessage msg, IMessageSink replySink)
Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.EndInvokeHelper(Message reqMsg, Boolean bProxyCase)
   at System.Runtime.Remoting.Proxies.RemotingProxy.Invoke(Object NotUsed, MessageData& msgData)
   at System.Func`6.EndInvoke(IAsyncResult result)
   at Microsoft.TeamFoundation.Build.Workflow.Activities.TfLabel.TfLabelInternal.EndExecute(AsyncCodeActivityContext context, IAsyncResult result)
   at System.Activities.AsyncCodeActivity`1.System.Activities.IAsyncCodeActivity.FinishExecution(AsyncCodeActivityContext context, IAsyncResult result)
   at System.Activities.AsyncCodeActivity.CompleteAsyncCodeActivityData.CompleteAsyncCodeActivityWorkItem.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)
Inner Exception Details:
Exception Message: TF246021: An error occurred while processing your request.
Technical information (for administrator):
SQL Server Error: 2601 (type SoapException)SoapException Details: <soap:Detail xmlns:soap="http://www.w3.org/2003/05/soap-envelope" />
Exception Stack Trace:
When I manually create a Label on the branch it works fine, please advice?
additional information: 
By changing "Label sources" to false the build does complete. Does SQL Server Error: 2601 indicate a duplicate key error in the TFS database? 
(Cannot insert duplicate key row in object '%.*ls' with unique index '%.*ls'.)
see also: https://technet.microsoft.com/en-us/library/aa258747(v=sql.80).aspx

Answer 1

Hi,
For this issue, you can check if you can connect to TFS and perform operations on other client machines. If yes, the problem related to your environment.
You can also delete the current workspace and cretea a new one, then do a workspace mapping. To delete the workspace, use tf workspace or delete it via Team Explorer. If the problem still exist, please let us know your environment, settings etc. for further
investigation.
Best regards,