# NotInLobbyModeException > Thrown when an operation requires lobby mode but the game is not in lobby mode. `gg.lode.observerapi.api.exception` --- ## Signature ```java public class NotInLobbyModeException extends Exception ``` ## Extends - `Exception` --- ## Default Message `"You are not in lobby mode!"` --- ## Related Pages - [[IObserverAPI]] - [[GameState]]