Dialog wird nicht geöffnet

Vehicle_OnDialogResponse(playerid, dialogid, response, listitem, inputtext[])
{
	#pragma unused inputtext
	switch (dialogid)
	{
	    case DIALOG_VEHICLE:
	    {
			if(response)
			{
				new vehicleid = GetPlayerVehicleID(playerid);
			    if(listitem == 0){TurnMotor(vehicleid);}
			    if(listitem == 1){TurnLicht(vehicleid);}
			    if(listitem == 2){TurnKofferraum(vehicleid);}
			    if(listitem == 3){TurnMotorhaube(vehicleid);}
			    if(listitem == 4){TurnTuren(vehicleid);}
				new motor = GetVehicleParam(vehicleid,MOTOR);
				new licht = GetVehicleParam(vehicleid,LICHT);
				new kraum = GetVehicleParam(vehicleid,KOFFERRAUM);
				new mhaube = GetVehicleParam(vehicleid,MOTORHAUBE);
				new lock = GetVehicleParam(vehicleid,TUREN);
				new string[512];
				if(motor == VEHICLE_PARAMS_OFF || licht == VEHICLE_PARAMS_OFF || kraum == VEHICLE_PARAMS_OFF|| mhaube == VEHICLE_PARAMS_OFF || lock == VEHICLE_PARAMS_OFF){format(string,sizeof(string),"{FFFFFF}Motor:{33AA33}An\n{FFFFFF}Licht:{33AA33}An\n{FFFFFF}Kofferraum:{33AA33}Auf\n{FFFFFF}Motorhaube:{33AA33}Auf\n{FFFFFF}Türen:{33AA33}Auf");}
//weitere abfragen.. war nur zu viel arbeit das hier zu veröffentlichen
		ShowPlayerDialog(playerid,DIALOG_VEHICLE,DIALOG_STYLE_LIST,"Fahrzeugkontrolle!",string,"ändern","abbrechen");
			}
		}
	}
	return 1;
}