此行的多个标记：-Reflection Handler无法解析-PacketType无法解析

Question

这是我的代码的一部分。它向我显示了多个错误：

Description Resource    Path    Location    Type
PackageType cannot be resolved to a variable    ParticleEffect.java /ArrowTrails/src/ParticleEffect line 219    Java Problem

Description Resource    Path    Location    Type
PacketType cannot be resolved   ParticleEffect.java /ArrowTrails/src/ParticleEffect line 216    Java Problem

Description Resource    Path    Location    Type
ReflectionHandler cannot be resolved    ParticleEffect.java /ArrowTrails/src/ParticleEffect line 216    Java Problem

出了什么问题？我希望你能帮助我。

static {
    for (ParticleEffect p : values())
        NAME_MAP.put(p.name, p);
    try {
        packetPlayOutWorldParticles = ReflectionHandler.getConstructor(PacketType.PLAY_OUT_WORLD_PARTICLES.getPacket(), String.class, float.class, float.class, float.class, float.class, float.class,
                float.class, float.class, int.class);
        getHandle = ReflectionHandler.getMethod("CraftPlayer", SubPackageType.ENTITY, "getHandle");
        playerConnection = ReflectionHandler.getField("EntityPlayer", PackageType.MINECRAFT_SERVER, "playerConnection");
        sendPacket = ReflectionHandler.getMethod(playerConnection.getType(), "sendPacket", ReflectionHandler.getClass("Packet", PackageType.MINECRAFT_SERVER));
    } catch (Exception e) {
        e.printStackTrace();
    }
}