[RESOLVED] Crystal Report Grouping error

Hi everyone!

I've a problem with all my report that i've create, At a certain time I get the error "Group Section cannot be printed condition field is nonexistent or invalid...", I thing the error appear after that a bring change to the Source Store Procedure, but i'm not 100% sure :(

I'm using the Crystal Version from Visual Studio 2005, and data source is a StoreProcedure from MSDE.

Any Idea?

Zak