Unrecognized attribute 'targetFramework'

I'm trying to up load my site and I'm getting this error message:

Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive.



Solution: 

This typically happens when you have an attribute of targetFramework="4.0" in the web.config but the App Pool is set to run ASP.NET 2.0. The targetFramework attribute is entirely unrecognized by ASP.NET 2.0 - so changing it to 2.0 won't have the desired effect.

Contact Support / Your Administrator and have the AppPool switched to 4.0.