Good afternoon!

I have the following problem: when I open any assignment in PerformancePoint Add-In for Excel, I choose "Submint Draft" in "Actions" field, choose checkbox "Include workbook", then I click accept (green arrow) and appears the window error:

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The remote server returned an error: (500) Internal Server Error

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And the next message comes out in EventViewer:

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Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 12.07.2013 16:56:02
Event time (UTC): 12.07.2013 12:56:02
Event ID: 2722609ede344906b1676a194bb2e57b
Event sequence: 305
Event occurrence: 2
Event detail code: 0
 
Application information:
    Application domain: /LM/W3SVC/702457041/ROOT-1-130181057852396830
    Trust level: Full
    Application Virtual Path: /
    Application Path: C:\Program Files\Microsoft Office PerformancePoint Server\3.0\WebService\
    Machine name: <MachineName>
 
Process information:
    Process ID: 6872
    Process name: w3wp.exe
    Account name: DOMAIN\Acc
 
Exception information:
    Exception type: BizServerException
    Exception message: Unknown form submission failure. Please submit again.
 
Request information:
    Request URL: http://localhost:46787/FormManager.transfer?BizApplicationID=cdada1d0-cffd-4f7a-b191-d62cf40c8293&AssignmentID=4707&FileType=.xlsx
    Request path: /FormManager.transfer
    User host address: ::1
    User: DOMAIN\Acc
    Is authenticated: True
    Authentication Type: NTLM
    Thread account name: DOMAIN\Acc
 
Thread information:
    Thread ID: 10
    Thread account name: DOMAIN\Acc
    Is impersonating: False
    Stack trace:    at Microsoft.PerformancePoint.Planning.Mal.ProcessFileHandler.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
 
 
Custom event details:

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  How do  solve it?