为什么不是每次都加载纹理？在 Unity C# 中 [关闭]

Question

我正在使用 C# 脚本在 Unity 中从 Internet 加载图片。有时一切正常，有时会报错，说纹理尚未加载。什么问题，我不明白，不同的图片稳定性不同。而且它不取决于重量。

public IEnumerator LoadImage()
{
    _img = _avatar.GetComponent<Image>();

    if (_url == "")
    {
        Debug.Log("пусто");
    }
    else
    {
        UnityWebRequest webRequest = UnityWebRequestTexture.GetTexture(_url);
        yield return webRequest.SendWebRequest();

        if (webRequest.isDone == true)
        {
            Texture texture = ((DownloadHandlerTexture)webRequest.downloadHandler).texture;
            Debug.Log(webRequest.error);
            _img.sprite = Sprite.Create((Texture2D)texture, new Rect(0, 0, texture.width, texture.height), Vector2.zero);
        }
        else
        {
            Debug.Log(webRequest.error);
        }
    }
}

这里是错误的文本：

InvalidOperationException：纹理尚未完成下载 UnityEngine.Networking.DownloadHandlerTexture.InternalGetTexture () (at <8493ecd1d0614bc382e5fcf3adc16a08>:0)
UnityEngine.Networking.DownloadHandlerTexture.get_texture () (at <8493ecd1d0614bc382e5fcf3adc16a08>:0)
DataBase+d__27.MoveNext () (at Assets/Scripts/DataBase.cs:161)
UnityEngine.SetupCoroutine.InvokeMoveNext（System.Collections.IEnumerator 枚举器，System.IntPtr returnValueAddress）（在：0）