["Login failed. Check your info."]

Same here..  I was   in game  for  3h and  I change  account.. worked for 30 min and   the game   sent me   to relog..  and  when ii log again say "Login failed check your info" and I don't understand  why.. my friends can  log whit my  account  but  I can't.. please.. how can I fix   this problem ?