JonnyDarcko

This is a super easy fix. When you run MineCraft it may be starting in a different version. On the bottom left of the start up screen you will see Profile and Version. Switch the version to 1.7.10 and run the game. I loaded a save file just to make sure but once it runs it will install the proper file base for Forge to run properly. Once you install forge, then you can switch back to 1.8 or whatever version you want.