Could not load file or assembly 'DotNetOpenAuth.Core

Question

I get the following error when I start my asp net mvc 4 application:

Could not load file or assembly \'DotNetOpenAuth.Core, Version=4.0.0.0, 
Culture=neutral         


        

Answer 1

I do not have the reputation to comment but I can verify that I had this exact problem and Jack gave the correct solution for me. I had recently pressed Add Service Reference and it broke the program with the above error message.

Deleting the _bin_deployableAssemblies folder, and your application's bin folder and then clean and rebuild your application made it work again.