Cannot create/shadow copy ‘DotNetOpenAuth.OAuth’ when that file already exists. – ASP.NET MVC41 min read January 16, 2014 by Sunny Sharma Error: Cannot create/shadow copy ‘DotNetOpenAuth.OAuth’ when that file already exists. How I solved it: Try to re-build the solution and it should work. It worked in my case, I’m not kidding ! Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Like this:Like Loading... Related