app.config “Could not find schema information” after converting to Visual Studio 2010 / .Net 4.0

Question

After upgrading my project to Visual Studio 2010 and .Net 4.0, my app.config file generates these messages upon building the project:

• Could not find schema inf

Answer 1

Try to kill the process in Task Manager next time, if it's already running.

P.S: It might be running at a remote machine.

Update: Since there is no solution I repeat my advice... Stop down voting. Maybe it's a bug but it might be related to un-terminated debug process. Just examine the Task Manager and kill xyz.vhost.exe of fx2.0, if any.