I need help!

_I can't log in into the client. _ Everytime I try, it just declines me and says "An unexpected error occurred while logging in. Please try again. If this issue persists contact support at support.riotgames.com I've tried it yesterday, and today. The same problem. I've done a repair, re-installing the game, but nothing. I have a couple of account at my disposition, each of a different server and nothing. Not even the PBE server is working