Enable-Migrations Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.

1. if you are using Code First
2. if your DBContext class is in another library and it still references the older v4.1 DLL, you will get the the error. Just check to make sure everything references the same version. Check your all dll's that reference the same entityframework.dll 5.0.0