Plugin forever loops an error instead of a task

So the server works and I can play. but the plugin does not do what it's supposed to. I get the error:

Here is my code:

Code:

package destroyBlock;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.scheduler.BukkitRunnable;

public class DestroyBlock extends JavaPlugin{

    Player p;

   
    @Override
    public void onEnable() {


            new BukkitRunnable() {
           
                @Override
                public void run() {
                    int x = p.getLocation().getBlockX();
                    int y = p.getLocation().getBlockY() - 1;
                    int z = p.getLocation().getBlockZ();
                    Location loc = new Location(p.getWorld(), x, y, z);

                    loc.getBlock().setType(Material.AIR);
                }
            }.runTaskTimerAsynchronously(this, 0, 20);
       
        }
    }
   

I know the code works, I tested it to destroy a block every time I moved and it worked. I'm trying to just have it run every second without an event but it won't work. Any suggestions?