[Help!] Hologram without ProtocolLib

I'm trying to make this without using ProtocoLib, but it doesn't work...
What am I doing wrong?

Code:java

package Millenary.Craft.Hologram;
 
import java.lang.reflect.Field;
 
import net.minecraft.server.v1_7_R1.DataWatcher;
import net.minecraft.server.v1_7_R1.Packet;
import net.minecraft.server.v1_7_R1.PacketPlayOutAttachEntity;
import net.minecraft.server.v1_7_R1.PacketPlayOutSpawnEntity;
import net.minecraft.server.v1_7_R1.PacketPlayOutSpawnEntityLiving;
 
import org.bukkit.Location;
import org.bukkit.craftbukkit.v1_7_R1.entity.CraftPlayer;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Player;
 
public class Hologram {
 
    private static int entityId = Short.MAX_VALUE;
    private static final int WITHER_SKULL = 66;
 
    @SuppressWarnings("deprecation")
    public static void spawnNametag(Player p, Location loc, double dy,  String message) {
 
        int hId = entityId++;
        int sId = entityId++;
 
        PacketPlayOutSpawnEntityLiving horse = new PacketPlayOutSpawnEntityLiving();
        PacketPlayOutSpawnEntity skull = new PacketPlayOutSpawnEntity();
        PacketPlayOutAttachEntity attach = new PacketPlayOutAttachEntity();
 
        // Initialize horse packet
        try {
            Field a = horse.getClass().getDeclaredField("a");
            a.setAccessible(true);
            a.set(horse, hId);
            a.setAccessible(false);
 
            Field b = horse.getClass().getDeclaredField("b");
            b.setAccessible(true);
            b.set(horse, (byte) EntityType.HORSE.getTypeId());
            b.setAccessible(false);
        } catch(Exception x) {
            x.printStackTrace();
        }
 
        setLocation(horse, dy, loc);
 
        try{
            Field w = PacketPlayOutSpawnEntityLiving.class.getDeclaredField("l");
            w.setAccessible(true);
            w.set(horse, getWatcher(message));
            w.setAccessible(false);
        } catch(Exception x) {
            x.printStackTrace();
        }
 
        // Initialize skull packet
        try {
            Field a = skull.getClass().getDeclaredField("a");
            a.setAccessible(true);
            a.set(skull, sId);
            a.setAccessible(false);
 
            Field b = skull.getClass().getDeclaredField("b");
            b.setAccessible(true);
            b.set(skull, (byte) WITHER_SKULL);
            b.setAccessible(false);
        } catch(Exception x) {
            x.printStackTrace();
        }
 
        setLocation(skull, dy, loc);
 
        // The horse is riding on the skull
        try{
            setAttach(attach, hId, sId);
        } catch(Exception x) {
            x.printStackTrace();
        }
 
        sendPacket(p, horse);
        sendPacket(p, skull);
        sendPacket(p, attach);
    }
 
    private static void setLocation(PacketPlayOutSpawnEntity living, double dy, Location loc) {
        try{
            Field c = living.getClass().getDeclaredField("c");
            c.setAccessible(true); // allows us to access the field
            c.set(living, (int) Math.floor(loc.getX() * 32.0D));
            c.setAccessible(false);
            Field d = living.getClass().getDeclaredField("d");
            d.setAccessible(true); // allows us to access the field
            d.set(living, (int) Math.floor(loc.getY() * 32.0D));
            d.setAccessible(false);
            Field e = living.getClass().getDeclaredField("e");
            e.setAccessible(true); // allows us to access the field
            e.set(living, (int) Math.floor(loc.getZ() * 32.0D));
            e.setAccessible(false);
        } catch(Exception x) {
            x.printStackTrace();
        }
    }
 
    private static void setLocation(PacketPlayOutSpawnEntityLiving living, double dy, Location loc) {
        try{
            Field c = living.getClass().getDeclaredField("c");
            c.setAccessible(true); // allows us to access the field
            c.set(living, (int) Math.floor(loc.getX() * 32.0D));
            c.setAccessible(false);
            Field d = living.getClass().getDeclaredField("d");
            d.setAccessible(true); // allows us to access the field
            d.set(living, (int) Math.floor(loc.getY() * 32.0D));
            d.setAccessible(false);
            Field e = living.getClass().getDeclaredField("e");
            e.setAccessible(true); // allows us to access the field
            e.set(living, (int) Math.floor(loc.getZ() * 32.0D));
            e.setAccessible(false);
        } catch(Exception x) {
            x.printStackTrace();
        }
    }
 
    private static DataWatcher getWatcher(String text) {
        DataWatcher watcher = new DataWatcher(null);
 
        watcher.a(10, (String) text); // Entity name
        watcher.a(11, (Byte) (byte) 1); // Show name, 1 = show, 0 = don't show
        watcher.a(12, -1700000); //Wither health, 300 = full
        // health
 
        return watcher;
    }
 
    private static void setAttach(PacketPlayOutAttachEntity a, int h, int s) {
        try {
            Field fa = a.getClass().getDeclaredField("a");
            fa.setAccessible(true); // allows us to access the field
            fa.set(a, (int) h);
            fa.setAccessible(false);
 
            Field fb = a.getClass().getDeclaredField("b");
            fb.setAccessible(true); // allows us to access the field
            fb.set(a, (int) s);
            fb.setAccessible(false);
        } catch(Exception e){
            e.printStackTrace();
        }
    }
 
    private static void sendPacket(Player player, Packet packet){
        try{
            ((CraftPlayer)player).getHandle().playerConnection.sendPacket(packet);
        } catch(Exception x) {
            x.printStackTrace();
        }
    }
}