5.4.8 Client do not work

Hi everyone,
I downloaded the 5.4.8 Client yesterday. I changed realmlist and andone the only reeding check box for the config in wtf.
It worked, I startet to playing my first low level charakters. But as i tried to log in today i get an error massage that i need a battle. net account. I checked the realmlist and the only read checkbox, both is still ok.
I tried to looking for an answer here in the forum but all answers i found are only this 2 options of solving and they are still alright. wotlk works good as ever only mop got this problem and like a said yesterday night it works.
Do anyone have a glue what i`m able to do here?

PS: my configs from yesterday are on added to the config data (that was empty yesterday only the first 3 lines was ther yesterday because of new client today is way more)
and no addons used so that cant be a problem.

Make sure you are logging in using your username and password, not your email address.
Verify that your config.wtf file contains the following line:
SET realmlist "logon.warmane.com"
For more information, please check to the following guide:
Warmane realmlist guide

Thanks for the Answer but all done and all right like a said in the first post. Thats why I asking here. Any else Ideas ? I wait one more day if anyone have a glue otherwhise the only other option seems to delete an reinstall 2 try again and hope for better. But perhabs I´m in good luck and someone else have an answer.