Java 此行有多个标记：-无法解析反射处理程序-无法解析PacketType

这是我代码的一部分。它向我显示了多个错误，它们是：

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();
    }
}

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这不是一个重要的问题吗？你添加了相应的导入吗？我已经导入了。但它再次显示了相同的错误