I can't enter world.

Hello.

30 min ago server crashed and I was in battleground (at loading screen to Dalaran-BG ended) so server crashed and now I can't join my account also I can't make new character and I can't enter world with any character.

Can you help me please?

Edit:

I reinstall the whole game and it works. If that happens to someone delete whole game and reinstall. Thanks anyway!