migration to vs 2012 test project error

I tried to migrate  Framework 4.0 to 4.5. Everything works fine, but  i get this error on the test project.

Test Failed:" The current test instance has a TestContext that does not have a known result member.  This is not supported. Check that you are using the Visual Studio unit testing framework."

I tried to use  Microsoft.VisualStudio.QualityTools.UnitTestFramework from Framework  4.0 and 4.5, neither works.  Please, help.