Custom Action in C# used via WiX fails with error 1154
问题 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 template, at least for now. 1930 is the most recent build that seems to make a buildable C# CA with working references.) I have two custom action assemblies written in C#. One of them works fine. The other fails with the following error: CustomActionnNameHere returned actual error code 1154 (note this may not be 100% accurate