SharePoint 2010 Error with Performance Point Dashboard: The data source no longer exists or you do not have permissions to view it. Additional details have been logged for your administrator.

Note: SharePoint 2010 Beta 2

While using Performance Point’s Dashboard Designer, I received the following error.

The data source no longer exists or you do not have permissions to view it. Additional details have been logged for your administrator.

I went into the event log, and saw this:

Here is the text:

An exception occurred while running a report. The following details may help you to diagnose the problem:
Error Message: The data source no longer exists or you do not have permissions to view it. Additional details have been logged for your administrator.

Contact the administrator for more details.
Dashboard Name:
Dashboard Item name:
Report Location: {fc25930f-590e-26ac-7da4-f60f076f7b32}
Request Duration: 119.02 ms
User: SPS\david.frette
Parameters:

Exception Message: The data source no longer exists or you do not have permissions to view it. Additional details have been logged for your administrator.
Inner Exception Message:
Stack Trace: at Microsoft.PerformancePoint.Scorecards.Server.PmServer.ExecuteAnalyticReportWithParameters(RepositoryLocation analyticReportViewLocation, BIDataContainer biDataContainer)
at Microsoft.PerformancePoint.Analytics.ServerRendering.OLAPBase.OlapViewBaseControl.ExtractReportViewData()
at Microsoft.PerformancePoint.Analytics.ServerRendering.OLAPBase.OlapViewBaseControl.CreateRenderedView(StringBuilder sd)
at Microsoft.PerformancePoint.Scorecards.ServerRendering.NavigableControl.RenderControl(HtmlTextWriter writer)

PerformancePoint Services error code 20604.

I solved this issue by adding my user account to the visitors group of the site. Crazy!