Can't login anymore (MOP 5.4.8)

Hi sir/ma'am,

Good day!

I was just able to play fine this morning, but now, i can't seem to login anymore for some reason. It says that "This account should be converted to a Battle.net account". Did anyone else experienced this? I've deleted the Cache and WTF folder but still getting the same problem. Sometimes i would get a "World of Warcraft" retail has stopped working. WoW is already being exempted on my Trend-micro anti-virus, i even tried disabling it but still not able to log in.

Any assistance is greatly appreciated.

Thank you.

get a new WTF Folder from MoP torrent