Stuck in an unfinished arena (Minecraft)

212.42.38.93 server. I went to someone's warp, I thought that there was a store. / warp derevo is trapped in some kind of arena ... no command works. I tried to re-enter, it only turned out worse. Now I can't even enter the password, the error drops out. I created another account, tried to go there and try to get out. Also stuck. Please get me out of there. My nickname is PticaGovorun. Or break this worthless warp