Report Viewer in 2010 with .Net 3.5 causing Error when compiled

I'm using Vs 2010 with .Net 3.5. I have windows project and using Report Viewer for reporting purpose. I desi开发者_开发技巧gned reports using Report Viewer. It works fine on my machine but on deployment server, compiler gives the following error:

The report definition is not valid. Details: The report definition has an invalid target namespace 'http://schemas.microsoft.com/sqlserver/reporting/2008/01/reportdefinition' which cannot be upgr aded.

Please note that I have all of my report files as Content.

Thanks a million.

Is VS2010 and .net 3.5 installed on your build server? And reportviewer?