#define BUS_ERROR_DEVICE_NOT_TAKEN "org.freedesktop.login1.DeviceNotTaken"
#define BUS_ERROR_OPERATION_IN_PROGRESS "org.freedesktop.login1.OperationInProgress"
#define BUS_ERROR_SLEEP_VERB_NOT_SUPPORTED "org.freedesktop.login1.SleepVerbNotSupported"
+#define BUS_ERROR_SESSION_BUSY "org.freedesktop.login1.SessionBusy"
#define BUS_ERROR_AUTOMATIC_TIME_SYNC_ENABLED "org.freedesktop.timedate1.AutomaticTimeSyncEnabled"