When accessing calculation tab in BIDS I am getting error Unexpected error occurred
Q: When accessing calculation tab in Business Intelligence Development Studio (BIDS) I am getting error "Unexpected error occurred:Error in application".
A: Most likely this error is caused by mismatched SSAS dlls: msmdlocal.dll and msmgdsrv.dll. To fix this move copy this 2 dlls from folder:
c:\Program Files\Microsoft Visual Studio 8\Common7\IDE\PrivateAssemblies\
c:\Program Files\Common Files\System\Ole DB\
Note: Before replacing any dll make sure you backup them to safe location.
Additional info here.