Launcher bug

When I hit 'play' on Minecraft launcher, it gives me this error on 'Launcher log':

Completely ignored arguments: [--nativeLauncherVersion, 1164]
[21:18:07] [Client thread/INFO]: Setting user: AlaDyn172
[21:18:10] [Client thread/WARN]: Skipping bad option: lastServer:
[21:18:10] [Client thread/INFO]: LWJGL Version: 2.9.4

And after it gives me this error, the Minecraft won't start, please help me!