VS2015 Unit testing: ShimDateTime missing in System.Fakes; only Stub functions

Been trying to figure out how to get the Shims in unit testing method to work. It has been giving me many different errors and I am listing it here: Severity Code Description Project File Line Suppression State Error CS0115 ‘StubDSA.HashData(byte[], int, int, HashAlgorithmName)’: no suitable method found to override [C:\Users\User\Documents\Visual Studio 2015\Projects\UnitTestProj\SimpleCalculatorTest\obj\Debug\Fakes\m\f.csproj] UnitTestProj C:\Users\Users\Documents\Visual