The report definition is not valid

Question

I have converted an .rdlc rerort from SSRS 2005 to SSRS 2008. Now when I am going to build that project I have got error.

The report defi

Answer 1

It might be a conversion problem. Recreate a new 2008 report. And I suggest using VS2010. I have the same problem when editing a report with VS2012.