Nostalrius Begins - Quality wow vanilla realm (1.12)

So I am trying to delete my character "Yautrais" but it says "Character deletion failed". Doing it because i don't want to play that particular class. Tried to do everything starting from deleting in game items, pets, quests etc. and even in the WoW folder itself, the WTF section with the players information.

Help Please.

I figured it out!

I was in a guild, but I was the only one and I had to leave the guild before I could delete my character.

Thank you myself