Cube calculation error

Upon building a cube in analysis services, i go to the calculations tab and i get an an error on the page... "Unexpected error occurred: Error in the application".!!!!

Thus, i can't do any calculated measures. Anyone, know what this is ?

Thanks LP

Check out http://support.microsoft.com/default.aspx/kb/926421.|||There are 2 DLLs msmdlocal.dll and msmgdsrv.dll in these folders:
C:\Program Files\Microsoft Visual Studio 8\Common7\IDE\PrivateAssemblies
C:\Program Files\Common Files\System\Ole DB

The ones in the PrivateAssemblies folder are older versions so you copy the ones from the OLE DB folder to the PrivateAssemblies folder and the problem goes away.