Minecraft Launcher Opens but the Game itself doesn't.

I Have this Bug in my Game Launcher. Whenever i try to open the game, The launcher dissapears for a couple of seconds. Then appears with this message:

Completely ignored arguments: [--nativeLauncherVersion, 307]
[20:28:22] [Client thread/INFO]: Setting user: Bandit74100_PL
[20:28:23] [Client thread/INFO]: LWJGL Version: 2.9.4

And Then i tried it again. Same thing happened.