It does sound like issue with framework versions - maybe the project file says framework version 2.0 but IIS runs it under 3.5 or something.
If nothing helps, recreate project from scratch using VS2010 and then manually copy/include all files.
It does sound like issue with framework versions - maybe the project file says framework version 2.0 but IIS runs it under 3.5 or something.
If nothing helps, recreate project from scratch using VS2010 and then manually copy/include all files.