SetDifficultyPacket

Giving this issue when pvp

The Code:

PHP:

public function DisablePvP(Player $player){
  $plugin = $this->plugin;
  $plugin->getServer()->setConfigInt("difficulty", 0);
  $pk = new SetDifficultyPacket();
  $pk->difficulty = $plugin->getServer()->getDifficulty();
  $player->dataPacket($pk);
     }

Code:

  if($args[0] == "on"){
  $this->ActivatePvP();
  $pl->sendMessage(T::BLUE."PvP Activated");
  }else if($args[0] == "off"){
  $this->DisablePvP();
  $pl->sendMessage(T::RED."PvP Deactivated");

 

What do you see that's wrong with calling the function?

PHP:

public function DisablePvP(Player $player){

Code:

$this->DisablePvP();