Spigot NPC 1.12.2 programieren

[TntTastisch]

Hey,
ich programmiere derzeitig ein NPC Plugin für die Version 1.12.2 doch wenn ich den Spawn Befehl ausführe für das Entity kommt eine Fehlermeldung könnt ihr mir weiterhelfen?

import com.mojang.authlib.GameProfile;
import net.minecraft.server.v1_12_R1.*;
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.craftbukkit.v1_12_R1.CraftServer;
import org.bukkit.craftbukkit.v1_12_R1.CraftWorld;
import org.bukkit.craftbukkit.v1_12_R1.entity.CraftPlayer;
import org.bukkit.entity.Player;

import java.lang.reflect.Field;
import java.util.UUID;

public class EntityAPI {

    public static void spawn(Location loc, String name) {
        MinecraftServer nmsServer = ((CraftServer) Bukkit.getServer()).getServer(); //NMS Server
        WorldServer nmsWorld = ((CraftWorld) loc.getWorld()).getHandle(); //NMS World Server
        GameProfile gp = new GameProfile(UUID.randomUUID(), name); //NMS Game Profile

        EntityPlayer npc = new EntityPlayer(nmsServer, nmsWorld, gp, new PlayerInteractManager(nmsWorld));
        npc.setLocation(loc.getX(), loc.getY(), loc.getZ(), loc.getYaw(), loc.getPitch());

        nmsWorld.addEntity(npc);

        sendPacket(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, npc));
        sendPacket(new PacketPlayOutNamedEntitySpawn(npc));
        sendPacket(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.REMOVE_PLAYER, npc));
    }

    static void sendPacket(Packet<?> packet) {
        for(Player p : Bukkit.getOnlinePlayers()) {
            ((CraftPlayer) p).getHandle().playerConnection.sendPacket(packet);
        }
    }
    public void setValue(Object obj,String name,Object value){
        try{
            Field field = obj.getClass().getDeclaredField(name);
            field.setAccessible(true);
            field.set(obj, value);
        }catch(Exception e){

            e.printStackTrace();
        }

    }

    public Object getValue(Object obj,String name){

        try {
            Field field;

            field = obj.getClass().getDeclaredField(name);

            field.setAccessible(true);
            return field.get(obj);
        }catch(Exception e) {
            e.printStackTrace();

        }
        return null;
    }
}

[13:30:34] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.NullPointerException: null
    at net.minecraft.server.v1_12_R1.EntityTrackerEntry.broadcastIncludingSelf(EntityTrackerEntry.java:300) ~[spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.EntityTrackerEntry.d(EntityTrackerEntry.java:278) ~[spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.EntityTrackerEntry.track(EntityTrackerEntry.java:207) ~[spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.EntityTracker.updatePlayers(EntityTracker.java:182) ~[spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:834) ~[spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) ~[spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) ~[spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
    at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spigot-1.12.2.jar:git-Spigot-dcd1643-e60fc34]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]

Danke schon mal im vor raus!