Okay I'm not sure if this is a technical issue or me being a idiot issue but...I can't seem to delete one of my characters.

I had made it a while ago and now i don't want it but every time i try to delete it i get a message that says

" All the Sub Password must be unset in order to delete"

Being confused already i tried, changing my Sub password, then i tried completely deleting it. Nothing is working... After fiddling with the stupid sub password for a while i gave up and decided to ask. What's the stupid message mean and how am i supposed to delete my character?