Nostalrius Begins - Quality wow vanilla realm (1.12)

Everything has worked fine up until this point. I'm in the southern barrens doing the Weapons of Choice quest, I was also in a party with one other (maybe could've triggered it). But all the sudden I got a WoW error. And everytime I try to login, after the screen finished loading, error again. Anyone know what I can do?

Greetings pcsbos,

Delete your WDB/WTF folders, disable all addons and try again.

Regards,
GM Tyreael