Hey -
Opening the project files has me slightly confused. I see the .sln for Paintball and FPSProject. I also see the .uproject for Paintball however FPSProject does not have a .uproject. Paintball.uproject and Paintball.sln both opened without any issues. FPSProejct.sln is failing to load when opened and without a .uproject file I cannot generate the project files to fix this error.
To help clear up my confusion could you explain what your original issue is again?