I used the GitHub extension of Visual Studio 2015 to clone my project onto a new computer. I try to restore packages and I get an error that says:
NuGet Pa
This might be a bit late but it will still help somebody. When you try to check in your code and you get this kind of an error, it means that you had the package installed and uninstalled it again, so you just need to locate the package under included changes, in my example i an using TFS, and exclude or undo. this will solve the issue.