vb.net - LocalProcessingException was unhandled -

trying test report , error message says:

an unhandled exception of type 'microsoft.reporting.winforms.localprocessingexception' occurred in microsoft.reportviewer.winforms.dll additional information: error occurred during local report processing."

any idea why face such error?!

you using vs2010 , innerexception says that:

the report definition not valid. details: report definition has invalid target namespace 'schemas.microsoft.com/sqlserver/reporting/2008/01/…; cannot upgraded. 

so have use correct reportviewer library 10.0.