Plutonium

I was just playing with my friends on a custom server, and when I left and tried to log back in I couldn't so ! I relaunched my plutonium and got an error message that said that I had been banned for 7 days. I don't know if there was an error or something but please go look at the logs or something.
My friend tried to make me another account with his email but I still couldn't join. So please look into it.