Fatal: failed to find callback

Recently I upgraded this plugin and got this error:

E/DownloadWorker( 7363): Fatal: failed to find callback

I had followed the instruction to set up the codes on Android and iOS, on Flutter side I used a wrapper and the implementation like:

...
static void downloadCallback(String id, DownloadTaskStatus status, int progress) {
    if (taskFuncMap.containsKey(id)) {
      if (status == DownloadTaskStatus.complete) {
        taskFuncMap[id](STATUS_COMPLETE);
      } else if (status == DownloadTaskStatus.failed) {
        taskDirMap[id].delete(recursive: true);
        taskFuncMap[id](STATUS_FAILED);
      }
    }
  }

  Downloader._internal() {
    FlutterDownloader.registerCallback(downloadCallback);
  }

Could someone give me some hints to figure out this issue? Thank you!

[chainzhang]

@hnvn Sorry, I found that I forgot calling FlutterDownloader.initialize() before running the App instance. I didn’t know that it’s required. It would be nice to indicate this usage in the document. Anyway, thanks for making this awesome plugin.

await FlutterDownloader.initialize();
runApp(App());

@alanmlira @mrdong916 I Hope it helps.

[alanmlira]

I’m receiving this same problem:

I/flutter (27378): Download task is enqueued with id(7c2cb95b-4f71-431b-9248-d3f752516f4c)
I/flutter (27378): downloadFile.taskId: 7c2cb95b-4f71-431b-9248-d3f752516f4c
E/DownloadWorker(27378): Fatal: failed to find callback
D/skia    (27378): --- SkAndroidCodec::NewFromStream returned null
D/skia    (27378): --- SkAndroidCodec::NewFromStream returned null
D/skia    (27378): --- SkAndroidCodec::NewFromStream returned null

PS: Testing on the example project in this repository works.