When you said that you installed SAP Crystal Reports for Visual Studio version (with latest service pack) - did you install the exe or the MSI? The install file is this one:
http://downloads.businessobjects.com/akdlm/cr4vs2010/CRforVS_13_0_6.exe
Double check that all of the CR assemblies referenced in your project are version 13.x
Google the error - lots of reasons for it.
- Ludek