assembly error! Trying to add to webforms project fw 4.5.1


Visual Studio 2012
FW 4.5.1
Web Forms

Hi all,

I'm trying to get this going and I'm running into a snag. If I set my FW to 3.5 it works fine when I jump to 4.0 + it fails. According to the website it should work for fw 3.5 and better. Anyone else have this issue? Please help under time constraints to get this completed.

Error 1 'Could not load file or assembly 'Simplovation.Web.Maps.VE, Version=, Culture=neutral, PublicKeyToken=ddd80d9b18c0a4dc' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)'