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[UWP] Unhandled Exception: The application called an interface that was marshalled for a different thread.

See original GitHub issue

The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD)) is raised at the only line in the following method in WorkScheduler.cs;

protected async void TakeFromPendingTasksAndRun()
{
    await TakeFromPendingTasksAndRunAsync().ConfigureAwait(false); 
}

I have an ItemTemplate for displaying an image;

<ff:FFImage Name="Image"
                            VerticalAlignment="Stretch" 
                            HorizontalAlignment="Stretch"
                            TransformPlaceholders="False"
                            LoadingPlaceholder="ImgLoading.png"
                            ErrorPlaceholder="ImgError.png"
                            CacheDuration="30"
                            RetryCount="3"
                            RetryDelay="250"
                            DownsampleToViewSize="True"
                            DownsampleMode="Default"
                            Source="{Binding ImageUri}" />

ImageUri is a property on an object that is in an ObservableCollection<T>

Can your help? I’m lost as to how to fix this. Thanks!

Full exception detail is:

      HResult=-2147417842
      Message=The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD))
      Source=Windows
      StackTrace:
           at Windows.UI.Xaml.DependencyObject.GetValue(DependencyProperty dp)
           at FFImageLoading.FFImage.get_SuccessCommand()
           at FFImageLoading.FFImage.OnSuccess(SuccessEventArgs e)
           at FFImageLoading.FFImage.<LoadImage>b__12_2(ImageInformation imageInformation, LoadingResult loadingResult)
           at FFImageLoading.Work.WorkScheduler.<>c__DisplayClass47_0.<CreateFrameworkTask>b__0(ImageInformation size, LoadingResult result)
           at FFImageLoading.Work.ImageLoaderTask`2.<RunAsync>d__109.MoveNext()
        --- End of stack trace from previous location where exception was thrown ---
           at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
           at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
           at System.Runtime.CompilerServices.ConfiguredTaskAwaitable.ConfiguredTaskAwaiter.GetResult()
           at FFImageLoading.Work.WorkScheduler.<RunImageLoadingTaskAsync>d__50.MoveNext()
        --- End of stack trace from previous location where exception was thrown ---
           at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
           at FFImageLoading.Work.WorkScheduler.<RunImageLoadingTaskAsync>d__50.MoveNext()
        --- End of stack trace from previous location where exception was thrown ---
           at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
           at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
           at System.Runtime.CompilerServices.ConfiguredTaskAwaitable.ConfiguredTaskAwaiter.GetResult()
           at FFImageLoading.Work.WorkScheduler.<TakeFromPendingTasksAndRunAsync>d__49.MoveNext()
        --- End of stack trace from previous location where exception was thrown ---
           at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
           at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
           at System.Runtime.CompilerServices.ConfiguredTaskAwaitable.ConfiguredTaskAwaiter.GetResult()
           at FFImageLoading.Work.WorkScheduler.<TakeFromPendingTasksAndRun>d__46.MoveNext()```