The problem is caused because the LinkModule was renamed to List, but you still have the old files so when VS tries to compile those old files it causes these errors. You can solve it by deleting the folder named LinkModule, it is not needed anymore since the files are now in the List folder.
But as Asad said, really if working in VS we recommend using the mojoPortal source code. You are basically opening the pre-compiled deployment files in VS so it opens it as a Web Site Project type and it treats all files as part of the project whereas in the source code our web project is really a Web Application project type not a Web Site project type, it has a .csproj file that tells it what files are in the project.
Hope it helps,