HOW TO FIX TERRARIA NOT LAUNCHING (XNA Framework Error, Specifically) Unhandled Exception: System IO FileNotFoundException: Could not load file or assembly 'Microsoft Xna Framework, Version=4 0 0 0, Culture=neutral, PublicKeyToken=842cf8be1de50553' or one of its dependencies The system cannot find the file specified at Terraria Program LaunchGame(String[] args, Boolean monoArgs)