Wo liegt der Fehler ? -.-

public void nick(Player p, String nickname) {

        EntityHuman eh = ((CraftPlayer)p).getHandle();
        PacketPlayOutEntityDestroy p29 = new PacketPlayOutEntityDestroy(eh.getId());
        PacketPlayOutNamedEntitySpawn p20 = new PacketPlayOutNamedEntitySpawn(eh);

        try {

            Field profileField = p20.getClass().getDeclaredField("b");
            profileField.setAccessible(true);
            profileField.set(p20, new GameProfile(p.getUniqueId(), nickname));

        } catch (Exception e) {e.printStackTrace();}

        for(Player other : Bukkit.getOnlinePlayers()) {

            if(!other.getName().equals(p.getName())) {

                ((CraftPlayer)other).getHandle().playerConnection.sendPacket(p29);
                ((CraftPlayer)other).getHandle().playerConnection.sendPacket(p20);

            }

        }

    }