I also faced the similar problem. I googled but couldn’t find the solution. So I tried on my own and here is my solution.
Open you solution file in notepad. Make 2 changes
- Replace “Format Version 12.00” with “Format Version 11.00” (without quotes.)
- Replace “# Visual Studio 2012” with “# Visual Studio 2010” (without quotes.)
Hope this helps u as well……….