Custom Subscribe Issue (YOLO Application)

[ShawnZhou997]

• I am at the right place and my issue is directly related to ROS#. General technical questions I would post e.g. at ROS Answers or Stack Overflow. For library-specific questions I would look for help in the corresponding library forums.
• I have thoroughly read the Contributing Guideline and writing this issue is the right thing to do in my case.

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• I searched the Wiki, open and closed issues for an answer. I tried my best to find the answer by myself without success. I believe that the discussion we will have in this issue, and the solutions we might find, will help me, and likely other community members who have a similar problem.

Here is my question:

Hi, I'm trying to Sub a custom MessageType in Unity but end up in failure.

The terminal in Ubuntu shows:
2025-03-10 15:30:20+0800 [-] [ERROR] [1741591820.225644]: [Client 7] [id: /detection_result:0] subscribe: Unable to load the manifest for package RosSharpMessages. Caused by: RosSharpMessages

The MessageType content is

My test script in Unity is

using RosSharp.RosBridgeClient;
using RosSharp.RosBridgeClient.MessageTypes;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace RosSharp.RosBridgeClient
{
    public class CustomDetectionSub : UnitySubscriber<MessageTypes.RosSharpMessages.DetectionResult>
    {
        public Vector3[] arucoLoc;
        public Vector3 baseLoc;
        public Vector3 asmObjLoc;
        public Vector3[] brickLocs;
        protected override void Start()
        {
            Topic = "/detection_result";
            arucoLoc = new Vector3[2];
            brickLocs = new Vector3[3];
            base.Start();
        }
        protected override void ReceiveMessage(MessageTypes.RosSharpMessages.DetectionResult msg)
        {
            Debug.Log(msg.class_name);
            if(msg.class_name == "aruco_0")
            {
                arucoLoc[0] = new Vector3((float)msg.x, (float)msg.y, (float)msg.z);
            }
            else if(msg.class_name == "aruco_1")
            {
                arucoLoc[1] = new Vector3((float)msg.x, (float)msg.y, (float)msg.z);
            }
            else if(msg.class_name == "base")
            {
                baseLoc = new Vector3((float)msg.x, (float)msg.y, (float)msg.z);
            }
            else if(msg.class_name == "asm obj")
            {
                asmObjLoc = new Vector3((float)msg.x, (float)msg.y, (float)msg.z);
            }
            else if(msg.class_name == "brick")
            {

            }
        }

    }
}

I've applied some other custom topics and the same issue showed never once.
Is there anything I've missed?

Thank you.

[ShawnZhou997]

By the way, there might be some BUGs in the extension UI.
No ‘Generate' button, as follows.

Using Version ros-sharp1.7.1.

[ShawnZhou997]

Refered to the pages as follows:
https://answers.ros.org/question/395708/
and
RobotWebTools/rosbridge_suite#415

https://robotics.stackexchange.com/questions/60435/rosbridge-and-roslibjs-unable-to-load-the-manifest-for-package

and others.

I've sourced the devel/setup.bash and problems still be there.

Maybe it is a common issue among rosbridges?