# AlreadyInLobbyModeException > Thrown when attempting to set the game state to LOBBY when already in lobby mode. `gg.lode.observerapi.api.exception` --- ## Signature ```java public class AlreadyInLobbyModeException extends Exception ``` ## Extends - `Exception` --- ## Default Message `"You are already in lobby mode!"` --- ## Related Pages - [[IObserverAPI]] - [[GameState]]