Why am I getting 'Assembly '*.dll' must be strong signed in order to be marked as a prerequisite.'?

Question

I\'m trying to compile my excel addin using C# 4.0, and started to get this problem when building my project in Visual Studio. It\'s important to tell you that I haven\'t had th

Answer 1

If your main project using some library projects and have reference to them, you can cause this problem if your project reference to a assembly dll file instead to library project when you change something in your library project (ex: rename a class).

You can check all references to your main project by view in Object Browser window (menu View->Object Browser). A reference to a dll file always has a version number. Ex: TestLib [1.0.0.0]

Solution: delete the current reference of your main project to the library project and add reference to that library project again.