Can't start the Game

Put the summary of the bug you're having here

What I expected to happen was...:
The Game will start and i can play it

What actually happened was...:
No Program/Screen for the Game showed up and the Launcher popped up few moments after starting the game, showing me the Crash Report

Steps to Reproduce:
1. Start the Minecraft Launcher
2. Click on "Play"
3. Wait.. no Loading Screen, no Minecraft Program
4. See the Launcher Screen popping up with the Crash report