The Image message subscribed in ROS is displayed as red question marks in Unity

In fact, I subscribed to the topic type of /sensor_msgs/Image in ROS and displayed on the Texture in Unity, but the result is displayed as a red question mark. I have tried to load image data with different APIs, but that has no effect. I want to know what I should do?
Here is my code:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using Unity.Robotics.ROSTCPConnector;
5. using RosMessageTypes.Sensor;
6.  
7. public class MainCameraTopicSubscriber : MonoBehaviour
8. {
9.     public MeshRenderer meshRenderer;
10.     private Texture2D texture2D;
11.     private byte[] image_Data;
12.  
13.     // Start is called before the first frame update
14.     void Start()
15.     {
16.         texture2D = new Texture2D(2, 2);
17.      
18.         meshRenderer.material = new Material(Shader.Find("Standard"));
19.         ROSConnection.GetOrCreateInstance().Subscribe<ImageMsg>("/dji_osdk_ros/main_camera_images", ImageInput);
20.     }
21.  
22.     void ImageInput(ImageMsg imageMsg)
23.     {
24.         image_Data = imageMsg.data;
25.         texture2D.LoadImage(image_Data);
26.         meshRenderer.material.SetTexture("_MainTex", texture2D);
27.     }

If anyone has a good solution, please tell me in time, thank you！！