I have a problem with an ASP.NET MVC site.
These are the details:
I see you fixed your issue, but for anyone googling:
I had this issue and in my case I just needed to register ASP.NET 4 with IIS. I was deleting and re-adding webs to fix other issues and simply forgot to do that. The command that worked for me was:
C:\Windows\Microsoft.NET\Framework64\v4.0.30319>aspnet_regiis -i
Your own .net version may be different, especially if you are in the future, so the above path may not be exactly right.