Closes 1.6.1 launcher when i try to open it

Put the summary of the bug you're having here: Closes the 1.6.1 game when i try to open it

What I expected to happen was...:
Describe what you thought should happen here: I thought that i was going to be able to play the new 1.6.1 update.

What actually happened was...:
Describe what happened here: When i downloaded the new launcher for 1,6.1 it downloaded completly but when i clicked on play a window opened for like 2 seconds but then closed.

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...