Unable to active windows store app .Unknown error:0x80040200

This Project was based on Windows10 IoTCore "Hello World"Damo.I Want to show Image by pure rgb bytes array.So I added my code in this.

public async void Func()
    {
        int ret;
        uint mode, x, y, width, height;
        mode = x = y = width = height = 0;
        ret = Roseek_ImageAcquisition_GetResolution(ref mode, ref x, ref y, ref width, ref height);
        RunFlag = true;
        uint buffsize = width * height * 3;
        RawFrameInfo frameinfo = new RawFrameInfo();
        byte[] Framebytes = new byte[buffsize];
        byte[] bgra = new byte[width * height * 4];
        while (RunFlag)
        {
            ret = Roseek_ImageAcquisition_FetchFrame(Framebytes, buffsize, ref frameinfo, 1000);
            if (ret == 0)
            {
                pFrameToRGB(Framebytes, bgra, (int)width, (int)height);
                /*                    IBuffer ibuf = new Windows.Storage.Streams.Buffer(width * height * 4);
                                    bgra.CopyTo(ibuf);

                                    SoftwareBitmap image = SoftwareBitmap.CreateCopyFromBuffer(ibuf, BitmapPixelFormat.Bgra8, (int)width, (int)height, BitmapAlphaMode.Ignore);
                                    SoftwareBitmapSource sf = new SoftwareBitmapSource();
                                   await sf.SetBitmapAsync(image);*/
                using (IRandomAccessStream RandomAccessStream = new InMemoryRandomAccessStream())
                {
                    BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.BmpEncoderId, RandomAccessStream);
                    encoder.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Ignore, width, height, 96, 96, bgra);
                    await encoder.FlushAsync();
                    await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.High, async () =>
                    {
                        var image = new BitmapImage();
                        await image.SetSourceAsync(RandomAccessStream);
                    }) ;

                }

                await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.High, () =>
               {
                   HelloMessage.Text = "While Loop! FetchFrame OK!";
               });
            }


        }

Some "Roseek" functions are from another DLLs. I think that some wrong codes may be added in while Loop. I debuged this App many times and it's OK. When I modified and continue to remote debuge this App ,some sample err like “Memery out" happened.After that,I can't active App forever, but App was installed in IoT device. I try what i can do like restart or uninstalling App,but not work. I'm a green hand about developing UWP on IoTCore. So can I ask that some wrong code I added in loop?

I get the very same error when using VS2017 / Xamarin whatEver template & UWP The app loads to the phone and then it crashes. So I would say that there is nothing wrong with your code. Winphones are not supported anymore by MS ;)