Solved ASyncPlayerChatEvent

Im trying to make this line of code work but it dosn't work at all, it dosn't event send the message "Plz work !".

Code (Text):

    @EventHandler
    public void onPlayerChatEvent(final AsyncPlayerChatEvent event) {
        Player p = event.getPlayer();
        p.sendMessage("Plz work !");
        if(Call911.getInstance().playerList911.contains(p)){
            p.sendMessage("WORK !");
            Call911.getInstance().playerList911.remove(p);  
        }
    }