Launcher Crash

Start launcher and click launch.
Screen flashes then Error msg says
Game Crash
An Unexpected issue occurred and the game has crashed. We're Sorry for the Inconvenience.
This is all the log says:
[12:54:25] [Client thread/INFO]: Setting user: TheeTimeLord
[12:54:26] [Client thread/INFO]: LWJGL Version: 2.9.4