whenever I type

"Game.rooms['sim'].lookAt(new RoomPosition(25,25, 'sim'))" or "Game.rooms['sim'].lookAt(25,25)" it returns this error, it does the same in ptr(I did change the room names)

"TypeError: Cannot read property '25' of undefined at N:2:176609 at Object.lookAt:2:168406 at _console1521126049290_0:1:15760 at eval:3:4 at Object.r.runCode:2:144628"

I Don't know what I'm doing wrong, any help would be appreciated, thanks.