Custom Action in C# used via WiX fails with error 1154

Question

I am using WiX 3.5.1930 in Visual Studio 2010, targeting the .NET Framework 3.5. (Later weekly builds of WiX seem to be very broken with respect to their custom action temp

Answer 1

I just found the same issue (using the correct .CA.dll file) and in my case it was because I wasn't using a static method. I had this:

public ActionResult MyMethod(Session session)

Instead of this:

public static ActionResult MyMethod(Session session)

After changing the method it worked just fine.

Hope it helps someone.