Need help with Bukkit.getScheduler()

Hi! So i'm tryna make a quick plugin but i'm kinda bad at coding and i have this error

Code:

Could not pass event BlockPlaceEvent to UltimatesImproved v1.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callBlockPlaceEvent(CraftEventFactory.java:127) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.ItemStack.placeItem(ItemStack.java:158) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PlayerInteractManager.interact(PlayerInteractManager.java:503) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:759) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:52) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_271]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_271]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot.jar:git-Spigot-db6de12-18fbb24]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_271]
Caused by: java.lang.IllegalArgumentException: Plugin cannot be null
        at org.apache.commons.lang.Validate.notNull(Validate.java:192) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.validate(CraftScheduler.java:397) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.runTaskTimer(CraftScheduler.java:123) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.runTaskLater(CraftScheduler.java:106) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        at com.portalthree.ultimatesimproved.Events.EventListener.onBlockPlaced(EventListener.java:26) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_271]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_271]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_271]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_271]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
        ... 18 more

Here's my EventListener

Code:

package com.portalthree.ultimatesimproved.Events;

import com.portalthree.ultimatesimproved.UltimatesImproved;
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.BlockPlaceEvent;
import org.bukkit.plugin.Plugin;

import java.util.Set;

public class EventListener implements Listener {

    @EventHandler
    public void onBlockPlaced(BlockPlaceEvent event){
        Material blockType = event.getBlock().getType();
        Player player = event.getPlayer();

        if(blockType == Material.ENDER_PORTAL_FRAME){
            event.setCancelled(true);
            player.getWorld().spawnEntity(player.getTargetBlock((Set<Material>) null, 200).getLocation(), EntityType.ENDER_CRYSTAL);
            Bukkit.getScheduler().runTaskLater((UltimatesImproved.getPlugin()), new Runnable() {

                @Override
                public void run() {
                    player.getWorld().strikeLightning(player.getTargetBlock((Set<Material>) null, 200).getLocation());

                }

            }, 40L);
            }
        }
    }

And my main class

Code:

package com.portalthree.ultimatesimproved;

import com.portalthree.ultimatesimproved.Events.EventListener;
import com.portalthree.ultimatesimproved.Items.ItemHandler;
import com.portalthree.ultimatesimproved.commands.MageUlti;
import org.bukkit.plugin.Plugin;
import org.bukkit.plugin.java.JavaPlugin;

public class UltimatesImproved extends JavaPlugin {
    public static Plugin plugin;

    @Override
    public void onEnable() {
        getCommand("mage").setExecutor(new MageUlti());
        ItemHandler.init();
        getServer().getPluginManager().registerEvents(new EventListener(), this);
    }

    public static Plugin getPlugin() {
        return plugin;
    }

    @Override
    public void onDisable() { }

}

 

How am i supposed to do that?

 

thanks!