.Net - CapturePicker The application called an interface that was marshalled for a different thread

I'm trying to use GraphicsCapturePicker but I'm getting the following error:

The application called an interface that was marshalled for a different thread

Here is the following methods that I'm using to open the picker:

public async void OpenCapturePicker(object sender, RoutedEventArgs e)
{
    Console.WriteLine("OpenCapturePicker");
    await Dispatcher.InvokeAsync(OpenCapturePicker);

}
private async void OpenCapturePicker()
{
    var picker = new GraphicsCapturePicker();

    picker.SetWindow(_capturableWindowHandle);
    var item = await picker.PickSingleItemAsync();
    if (item == null) return;
    //rest of code
}

The _capturableWindowHandle is defined in the constructor of the class like:

public SomeClass(){
 _capturableWindowHandle = new WindowInteropHelper(this).Handle;
}

Also I've an extension class that allows me to use the SetWindow method

public  static class CaptureHelper
{
    static readonly Guid GraphicsCaptureItemGuid = new Guid("79C3F95B-31F7-4EC2-A464-632EF5D30760");
    public static GraphicsCaptureItem CreateItemForWindow(IntPtr windowInteropHandler)
    {
        var factory = WindowsRuntimeMarshal.GetActivationFactory(typeof(GraphicsCaptureItem));
        var interop = (IGraphicsCaptureItemInterop) factory;
        var itemPointer = interop.CreateForWindow(windowInteropHandler, GraphicsCaptureItemGuid);
        var item = Marshal.GetObjectForIUnknown(itemPointer) as GraphicsCaptureItem;
        Marshal.Release(itemPointer);

        return item;
    }
    public static void SetWindow(this GraphicsCapturePicker picker, IntPtr hwnd)
    {
        var interop = (IInitializeWithWindow)(object)picker;
        interop.Initialize(hwnd);
    }
}

Any ideas?