crash during startup

Put the summary of the bug you're having here

What I expected to happen was...:
I expected minecraft to start, after pressing Play in the Launcher.

What actually happened was...:
First, nothing happened, then, minecraft opened for less then a second before closing, and creating an crash report tab in the launcher, with the report to mojang button.

Steps to Reproduce:
I have already stated what I did. I have no idea if it's possible to reproduce this, because I have no idea what happened. I just pressed Play like usual, and a Crash Report appeared