teleport and remove player.dat file not work

I have class main extends PluginBase and class Events implements Listener.
onEnable in main class:

PHP:

$this->getServer()->getPluginManager()->registerEvents(new Events($this), $this);


Events class:

PHP:

class Events implements Listener
{

    public $plugin;

    public function __construct(main $plugin)
    {
        $this->plugin = $plugin;
    }
    public function joinEv(PlayerJoinEvent $e)
    {
        $p = $e->getPlayer();
        $p->teleport($this->plugin->getServer()->getDefaultLevel()->getSpawnLocation()); //not work
        $name = strtolower($p->getName());
        @unlink("/mg/players/{$name}.dat"); //not work
    }
}


I set permission rwx to all dir.
Why this not work?

 

Are you sure the event is being called correctly? Try debugging to make sure.

 

Is there an error log that we can see?