getEntity() error and teleportToSpawn error

Heres my code

Code:

        @EventHandler
        public void onDamage(EntityDamageEvent event) {
            if(event.getEntity() instanceof Player) {
                Player p = (Player) event.getEntity();
                if(plugin.inJump.contains(p.getName())) {
                    event.setCancelled(true);
                }
            }
        }

    @EventHandler
    private void onPlayerMove(PlayerMoveEvent event) {
        this.event = event;
        if(plugin.inJump.contains(event.getPlayer().getName())) {
            Player player = event.getPlayer();


            Block block = (Block) player.getLocation().subtract(0.0D, 1.0D, 0.0D).getBlock();

            if(((Block) block).getType() == Material.GOLD_BLOCK) {
                player.addPotionEffect(new PotionEffect(PotionEffectType.SLOW, 20*5, 3));
                player.playSound(player.getLocation(), Sound.GHAST_SCREAM, 3, 2);
            }
            if(((Block) block).getType() == Material.BEDROCK) {
                teleportToSpawn(player);
            }
            if(((Block) block).getType() == Material.IRON_BLOCK) {
                player.addPotionEffect(new PotionEffect(PotionEffectType.BLINDNESS, 20*5, 3));
                player.playSound(player.getLocation(), Sound.GHAST_DEATH, 3, 2);
            }
            if(((Block) block).getType() == Material.DIAMOND_BLOCK) {
                player.addPotionEffect(new PotionEffect(PotionEffectType.CONFUSION, 20 * 5, 3));
                player.playSound(player.getLocation(), Sound.AMBIENCE_THUNDER, 3, 2);
            }

Heres my main

Code:

package classes;

import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.command.CommandExecutor;
import org.bukkit.configuration.ConfigurationSection;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;

import java.awt.*;
import java.util.ArrayList;
import java.util.HashMap;

public class main extends JavaPlugin {

    private main plugin;

    public ArrayList<String> inJump = new ArrayList<>();
    public HashMap<String, Location> oldLoc = new HashMap<>();
    public HashMap<String, ItemStack[]> oldItems = new HashMap<>();
    public String prefix = "§7[§bEnoJump§7] ";
    public String noperm = "§7[§bEnoJump§7] Du hast keine Permissions!";
    public String help = "§7[§bEnoJump§7] §6Help: /Enojump hilfe";
    public ConfigurationSection config;

    @Override
    public void onEnable() {
        getConfig().options().copyDefaults(true);
        saveConfig();
        this.reloadConfig();
        System.out.println("[EnoJump] Plugin version +!" + this.getDescription().getVersion() + " loaded!");
        new Listeners(this);
        getCommand("enojump").setExecutor(new Commands(this));
        Material mat = Material.DIAMOND;int amount = 1;
        ItemStack item = new ItemStack(Material.getMaterial(), 1);
    }

    @Override
    public void onDisable() {
        System.out.println("[EnoJump] Plugin deaktiviert!");

    }



    @SuppressWarnings("deprecation")
    public void leaveArena(Player player) {
        if(inJump.contains(player.getName())) {

            inJump.remove(player.getName());

            player.getInventory().clear();
            ItemStack[] old = oldItems.get(player.getName());
            player.getInventory().setContents(old);
            player.updateInventory();

            Location location = oldLoc.get(player.getName());
            player.teleport(location);


            player.sendMessage(prefix + "§cDu hast die Arena verlassen!");

        } else {
            player.sendMessage(prefix + "§cDu bist nicht in der Arena!");
        }
    }
}

 

What is the error? How do the teleportToSpawn method look like? Please post some more details about your problem