Duplicate System.Web in GAC!

Question

Hi

I am trying to deploy an asp .net MVC app onto II7 and getting the following error:

Could not load file or assembly 'System.Web' or one of its dependencies. An attempt was made to load a program with an incorrect format.

The server has .net 3.5 SP1 and I tried including the dll in the website bin with no luck!

I noticed in the GAC on the server there are 2 System.Web 2.0 one with the processor architecture x86 and another with AMD64 (server is Intel XEON), could this be causing this error?

Thanks

SOLUTION: Change the build platform target to x64, doh!

Answer 1

There are supposed to be two in the GAC. One is 32 bit and the other is 64 bit. It sounds, from the error, that you are trying to load a 64-bit dll into a 32-bit process. What bitness is the program compiled as? What bitness is the server OS?

Answer 2

Got the same error on a x64 IIS7. I changed the Application Pool setting "Enable 32-Bit Applications" to true.