The type or namespace could not be found

Question

I\'m currently trying to convert a WiX 3.5 custom actions project in Visual Studio 2008 to WiX 3.7 and Visual Studio 2012 and I\'m getting the following exception:

Answer 1

So it turned out that the dll being reference, while compiled to target the .Net 2.0 framework, was being compiled with the 4.0 compiler. Switching the project to compile with the 3.5 compiler solved the problem.