The assembly with display name 'VJSharpCodeProvider' failed to load

Question

I added an AjaxToolkit:AutoCompleteExtender to my ASP.Net 3.5 application. The web service lives in the same web application. Now I am getting this error when I hit F5/Debug

Answer 1

In my case, I was attempting to compile a BizTalk project in VS2010, and I got

Could not load file or assembly 'VJSharpCodeProvider, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. An error relating to security occurred. (Exception from HRESULT: 0x8013150A)

None of the other answers in posted so far here worked - but doing this on the user for my BizTalkServices IIS site did. This is only on my local machine, not actual production.

Whie the wisdom of giving the user for an IIS site admin priveledges is certainly debatable, perhas this will offer a clue for finding the real problem for someone.