Problem with scheduled tasks in a Listener

So i think i have to have an instance if my main.java in my listener, but i am not sure how to do that.
Console says that it cannot cast, and i do understand that, but i dont know how to fix it.

Code:java

package me.FirecatHD.RocketFrenzy;
 
import java.util.ArrayList;
import java.util.List;
 
import org.bukkit.Bukkit;
import org.bukkit.Effect;
import org.bukkit.Material;
import org.bukkit.entity.Arrow;
import org.bukkit.entity.Egg;
import org.bukkit.entity.Entity;
import org.bukkit.entity.HumanEntity;
import org.bukkit.entity.Player;
import org.bukkit.entity.Projectile;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.entity.ProjectileHitEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.plugin.Plugin;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;
 
public class RocketListener implements Listener {
 
 
    public static List<String> fraggerKit = new ArrayList<String>();
 
    public static List<String> getFraggerKit() {
    return fraggerKit;
 
    }
 
    public static List<String> rocketdelay = new ArrayList<String>();
 
    public static List<String> getRocketDelay() {
    return rocketdelay;
 
    }
 
    @EventHandler
    public void onPlayerInteract(final PlayerInteractEvent e){
 
        e.getPlayer();
 
        if(e.getPlayer().getItemInHand().getType() == Material.IRON_BARDING){
        if(e.getAction() == Action.RIGHT_CLICK_AIR || e.getAction() == Action.RIGHT_CLICK_BLOCK) {
 
                        e.getPlayer().launchProjectile(Arrow.class);   
 
                        rocketdelay.add(e.getPlayer().getName());
 
                        Bukkit.getServer().getScheduler().scheduleSyncDelayedTask((Plugin) this, new Runnable() {
                            public void run() {
 
                                rocketdelay.remove(e.getPlayer().getName());
 
                            }
                        }, 30); 
        }
        }
    }
 
    @EventHandler   
    public void onProjectileHit(ProjectileHitEvent e) {
 
        Projectile p = e.getEntity();
        if (!(p.getShooter() instanceof Player)) return;
        if (!(p instanceof Arrow)) return;
        if (!fraggerKit.contains (((HumanEntity) p.getShooter()).getName())) return;
        Arrow a = (Arrow) p;
 
        a.getWorld().playEffect(p.getLocation(), Effect.SMOKE, 0);
 
        a.getWorld().createExplosion(a.getLocation(), 4); {
 
            for (Entity en : a.getNearbyEntities(5, 5, 5)) {
                if (en instanceof Player) {
                        Player pl = (Player) en;
                        if (!(pl == e.getEntity().getShooter()))
 
                                a.remove();
                }
            }
        }
    }
 
        @EventHandler
        public void onProjectileHit1(ProjectileHitEvent e) {
                Projectile p = e.getEntity();
                if (!(p.getShooter() instanceof Player)) return;
                if (!(p instanceof Egg)) return;
                if (!fraggerKit.contains (((HumanEntity) p.getShooter()).getName())) return;
                Egg g = (Egg) p;
 
                p.getWorld().playEffect(p.getLocation(), Effect.SMOKE, 0);
 
                g.getWorld().createExplosion(g.getLocation(), 0); {
 
                    for (Entity en : g.getNearbyEntities(5, 5, 5)) {
                        if (en instanceof Player) {
                                Player pl = (Player) en;
                                if (!(pl == e.getEntity().getShooter()))
 
                                pl.addPotionEffect(new PotionEffect(PotionEffectType.BLINDNESS, 50, 0));
                                pl.addPotionEffect(new PotionEffect(PotionEffectType.WITHER, 70, 4));
                                pl.addPotionEffect(new PotionEffect(PotionEffectType.SLOW, 100, 0));
                        }
                    }
                }
        }
}

Anyone that can help, please do so
-Firecat

I really need help, anyone?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.