Double names on server

[Arroe]

Hey, i set up my server and finally think i got it to work, except i have one little problem. i added in my info about my account and my status in the command prompt, and now when i try to log on my server it says something about there already being an Arroe on the server and it's invalid. I think it sees the thing i put in with the command prompt and doesn't recognize me when i try to log on, instead it gives me the 1017 error. it thinks i am another person with the same name and doesn't like that. anyone get what i'm saying? how do i fix this?