[UWP] [XboxLive] [IL2CPP] Cant build solution. Object reference not set to an instance of an object.

Hi,

I am trying to build our UWP game in Visual Studio but I get the following errors:

Code (CSharp):

1. 1>------ Build started: Project: Il2CppOutputProject, Configuration: Master x64 ------
2. 1>Object reference not set to an instance of an object.
3. 2>------ Build started: Project: Tyd wag vir Niemand, Configuration: Master x64 ------
4. 2>Object reference not set to an instance of an object.
5. ========== Build: 0 succeeded, 2 failed, 0 up-to-date, 0 skipped ==========

I never used to have this problem, but a Windows Update bug caused Developer Mode and Developer Tools to get messed up and I needed to format and do a clean Windows installation. I've gotten everything installed and set up how I had it but for some reason when I try to build my project I get the error above now and I cant seem to figure out how to get more info on the matter.

I'm using Unity 2017.4.11 and Visual Studio 2017 Pro on Windows 10 Pro 64bit

Please any help would be greatly appreciated.