Could not determine whether 'assembly' is a multifile assembly. The assembly manifest may be corrupt.
The project system was unable to read an assembly referenced by your project such that the project system is unable to determine which files were referenced by the assembly.
To correct this error
Reinstall Visual Studio (if the assembly came with Visual Studio or the .NET Framework).
- or -
Reinstall the appropriate third-party control.
This error will not prevent the project from building. However, a run-time error is possible.