Your project is not referencing the “.NETFramework,Version=v4.5” framework.

Question

I am using VS 2015.

Your project is not referencing the \".NETFramework,Version=4.5\" framework. Add a reference to \".NETFramework,Version=4.5\" in

Answer 1

I had this same problem, and I ended up having to not only delete the contents of bin and obj folders, but also the .vs directory for the solution.