Error when deploying a web application.

Hello forumers.

The error:
Error 174 The CodeDom provider type "Microsoft.VJSharp.VJSharpCodeProvider, VJSharpCodeProvider, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" could not be located.

Additional info
I have been googleing a lot, and all I found is that .java makes conflicts (when my project doesn't use .java), that the web.config <compiler> tag is missing, but that's not my hand. I compiled it yesterday successful, but since today the error is appearing every time I try to compile and I haven't change a single file.

Any ideas?

Thanks a lot