I started to have this error since last night, had been playing without problem, I hope someone knows how to fix it.

Your connection was most probably cut off. It may be that the server you're playing on is having problems. Or your internet may be at fault. If you have a VPN/proxy and turn it off or on while playing, that may cause you to disconnect. It's also best to exit and restart the game if you get the error.

Restarting the game usually fixes it.