Building and Running

Hey I have been using Unity for a while and I decided to try making a multiplayer game. I started making one and i wanted to see if what i have so far works so i tried to build and run it to test it out. It gave me an error saying: Failed to Initialize player, could not preload global game manegar #0. Can someone help me on how to fix this?

Usually, a fresh installation will fix these kinds of issues .
Be sure that you, or others haven’t removed any important Unity installation files.