Permanent Fix to "Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information"

I keep getting this "Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information" Every time I had to restart IIS to temporarily fix it. I tried many things to resolve the issue nothing really helped. Finally I have a permanent fix : It's fixed in .Net 4.5 framework You have to install .NEt 4.5 and do nothing else. According to forums 4.5 requires VS 2012 And I m still using 2010