Cannot build project after adding Test project

I added the CustomModule.Tests from the sample code and now when I try to build the Test project, I get the error Source file '..\GlobalAssemblyInfo.cs' could not be found.

I tried building the regular 'CMSApp' project and the 'CMSApp_MVC' project which are also included in the solution.

When I try to build the solution, I get the same error.

Did I not set up the projects correctly? Why is this not working.