PacketContainer packet = main.getProtocolManager().createPacket(PacketType.Play.Server.GAME_STATE_CHANGE);
packet.getIntegers().write(0, 3);
packet.getBytes().write(0, (byte) 3);

try {
    main.getProtocolManager().sendServerPacket(target, packet);
} catch (InvocationTargetException e) {
    e.printStackTrace();
}