coroutine not working!

Questions & Answers
1

hi, guys, I am doing a 2d app to save and download the image I want to save the image from web and load the images save and load fine but the problem is it says coroutine cannot use thanks for listening!

error:
Coroutine ‘https://img.etimg.com/thumb/msid-67102450,width-300,imgsize-65522,resizemode-4/sedan-car-getty.jpg’ couldn’t be started!
UnityEngine.MonoBehaviour:StartCoroutine(String)
c__Iterator2:MoveNext() (at Assets/scripts/save and load/load.cs:250)
UnityEngine.MonoBehaviour:StartCoroutine(IEnumerator)
load:seq(String) (at Assets/scripts/save and load/load.cs:245)
load:image1() (at Assets/scripts/save and load/load.cs:78)
UnityEngine.EventSystems.EventSystem:Update()

here’s the code:
void seq(string url)
{

    StartCoroutine(Seq(url));
}

private IEnumerator Seq(string url)
{
    yield return StartCoroutine(url);
    yield return StartCoroutine(waittoload());
}

private IEnumerator imageload(string url)
{
StartCoroutine(DownloadImage(url));
yield return DownloadImage(url);
Debug.Log(“loaded”);
}
private IEnumerator waittoload()
{
yield return new WaitForSeconds(0f);

}

and the function i declared(courotine):
public void image1()
{
if (downloadimage.Instance.save == true)
{
if (downloadimage.Instance.imagesloaded <= 2)
downloadimage.Instance.loadimage1();

        if (downloadimage.Instance.imagesloaded <= 2)
            if (is2)
            {

                raw.texture = downloadimage.Instance.texture;

            }
            else
            {
                seq(downloadimage.Instance.url[0]);
                is2 = true;
                Debug.Log("imageloaded!");
            }

    }
    else
    {
        if (downloadimage.Instance.imagesloaded <= 2)
            Debug.Log("time to load");
        StartCoroutine(DownloadImage(downloadimage.Instance.url[0]));
        downloadimage.Instance.imagesloaded++;

    }
2

A coroutine does not retrieve a file from the web, it runs a process on a different thread. So on line 6 of your code block it will break because you are passing the url as a parameter for which coroutine to run. It interprets that url and searches for a coroutine in your script by that name (the url as a string). What you need to look into is WWW/UnityWebRequests.

As a brief example:

// Start the coroutine
string url = "";
Startcoroutine(GetImageFromWeb(url));

private IEnumerator GetImageFromWeb(string url)
{
     using (WWW request = new WWW(url))
     {
          yield return request;

          if(request.error != null)
          { 
                 // Do something with information returned
          }
          else Debug.LogError("Invalid Web Request: " + www.error);
     }
}

More information can be found here: Unity - Scripting API: WWW