Question I am new to Bukkit and I want some help on the permission

First of all, here is my AntiBlock.java code:

Code:java

 
package me.firstflames;
 
import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.permissions.Permission;
import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;
 
public class AntiBlock extends JavaPlugin
{
    public Permission playerPermission = new Permission("playerAbility.allowed");
 
    @Override
    public void onEnable()
    {
        new BlockListener(this);
        PluginManager pm = getServer().getPluginManager();
        pm.addPermission(playerPermission);
 
    }
    @Override
    public void onDisable()
    {
 
    }
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args)
    {
        if (cmd.getName().equalsIgnoreCase("giveme") && sender instanceof Player)
        {
            Player player = (Player) sender;
 
            if(player.hasPermission("playerAbility.allowed"))
            {
                player.setItemInHand(new ItemStack(Material.DIAMOND_AXE));
            }
            return true;
        }
        return false;
    }
}
 

here is the BlockListener.java code:

Code:java

 
package me.firstflames;
 
 
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.BlockPlaceEvent;
 
 
public class BlockListener implements Listener{
 
    public BlockListener(AntiBlock plugin)
    {
        plugin.getServer().getPluginManager().registerEvents(this, plugin);
    }
 
    @EventHandler
    public void onBlockPlace(BlockPlaceEvent e){
 
        Player player = e.getPlayer();
 
        if (!player.hasPermission("playerAbility.allowed")){
 
            e.setCancelled(true);
        }       
    }   
}
 

I am following the video here:

The question is that whenever I join the server,
I don't have the ability to place a block or use the command "giveme".
Also, I can't use the command /deop
It should be the permission problem, right?
So, what is the problem in my code?

thank you.

 

@ykn121 You'll probably have better luck in this forum http://bukkit.org/forums/plugin-development.5/