public void onDisable(){
	    for (Player all : Bukkit.getOnlinePlayers()){
	        if (stacker.containsa(all)){
	            getConfig().set("stacker." + all.getName(), "true");
	            saveConfig();
	        }
	    }
	}
	public void onEnable(){
	    for (Player all : Bukkit.getOnlinePlayers()){
	        if (getConfig().getString("stacker." + all.getName()).equalsIgnoreCase("true")){
	            stacker.add(all.getName());
	        }
	    }
	}