This account needs to be converted

Hey so i tried to log in with my account in MoP Frostwolf and i got this message "This account needs to be converted to a battle.net account" what am i supposed to do? i have the realmlists set to warmane.com but i dont get the reason why i have this message

Use username + password to login not email + password
Also make sure inside the config.wtf file you have the correct realm list
SET realmlist "logon.warmane.com"