Minecraft crashes after clicking play and returns to launcher

Yesterday I bought minecraft and installed it.It worked perfectly.Today it doesnt't work.It crashes after starting the game from launcher.Since yesterday I've only rebooted my PC(didn't install anything else).
I attached development console report and screenshot of minecraft just before it crashes.My specs:
AMD FX 6300
AMD R9 270X Sapphire Dual X
8GB RAM
ASUS M5A97 R2.0