Error on OnDialogResponse.

public OnDialogResponse(playerid, dialogid, response, listitem, inputtext[])
{
    if(response)
        {
        switch(dialogid == 1)
            {
                case 9001:
                {
                    SendClientMessageToAll(-1, "test");
                    if(strlen(inputtext) > 0)
                    {
                        new name[MAX_PLAYER_NAME], string[128];
                        GetPlayerName(playerid, name, sizeof(name));
                        format(string, sizeof(string), "VIP %s shouted: {00ffff}%s", name, inputtext);
                        SendClientMessageToAll(0xFFAA3300, string);
                    }
                    else
                    {
                        SendClientMessage(playerid, 0xFF000000, "Your shout needs to be more than 0 character!");
                    }
                }
            }
        }
    return 1;
}