Login denied. It asks me to change my account into a battle.net account

[SntGusi]

Good afternoon!
I write here because of the failure described in the title. I try to login to my Mist of Pandaria account and it denies my access. I would like to ask if it is a common problem or if it has a solution.
I am looking forward to solving it. Thank you all in advance!
Greetings :)

[Zcsxm2]

Greetings

2 possibilities

a) you try to log-in by your email address and not by the account name

b) the server list contains a wrong server name or an empty line. Go to your wow-folders, then "WTF", open it and go to "config"-data. Open it by words or another program. Create a new line by "enter", and copy-paste this line between: set realmlist logon.warmane.com. Save the document and close it. Now open your wow.exe, and try to log-in.

Kind regards