"You must log win with Battle.Net" at login

Hey. I will be concise. Downloaded the entire WoW 5.4.8 client. Set realmlist to "logon.warmane.com". Game starts fine. But when I try to log in, I got the "You must log in with Battle.Net account..." error. I've ot been able to find a solution to the problem so far.

I ALREADY TRIED those fixes:

-Deleting WoW/Cache folder.
-Deleting WoW/Data/Cache folder.
-Setting up the realmlist again.
-Deleting WoW.mfil and WoW.tfil files.
-Completely gave permision access to the "World of Warcraft" folder.
-Completely disabled Firewall and Windows Defender.
-Completely unchecked "Read-Only" box. My WoW folder is NOT in read-only state.
-Running game as administrator and with Windows 7 compatibility mode.
-I'm logging in using my username, NOT my email adress.

Any tips to solve this problem? I want to play this amazing server (old Neltharion, Cata player here).
Thanks in advance.

EDIT: Solved.

Solution:

1- Go to: https://www.warmane.com/download
2- Set "Expansion" to "Mists of Pandaria" and "Operating system" to "Windows" .
3- Click on download. When the torrent window prompts, just left this files checked: http://fotos.subefotos.com/8dd743219...0abffe3cao.png
4. After downloading just those files that I just told you to, copy them and paste them to your original WoW folder. Replace the files.
5. Enjoy.

Peace out.-