C# – Xamarin.Forms Errors (ADB0000:Value Cannot be null)

I found the solution with this answer. The only option you needed is enforceFocus.

Working Demo

jQuery

// Since confModal is essentially a nested modal it's enforceFocus method
// must be no-op'd or the following error results 
// "Uncaught RangeError: Maximum call stack size exceeded"
// But then when the nested modal is hidden we reset modal.enforceFocus
$.fn.modal.Constructor.prototype.enforceFocus = function() {};

This code help for resolve the below error in Xamarin- Windows (UWP) - Windows 8.1

"The text associated with this error code could not be found."

  public interface IServerCommunication
  {
   Task<string> GetFromServerAsync(string URL);
  }   

//later on, when I download the data: (URL is a provided string)

  string result = await DependencyService.Get<IServerCommunication> 
  ().GetFromServerAsync(URL);

   public async Task<string> GetFromServerAsync(string URL)
   {
    HttpClient client = await PreparedClientAsync();

    HttpResponseMessage response;

    try
    {
    response = await client.GetAsync(new Uri(URL));

    IBuffer buffer = await response.Content.ReadAsBufferAsync();
    DataReader reader = DataReader.FromBuffer(buffer);
    byte[] fileContent = new byte[reader.UnconsumedBufferLength];
    reader.ReadBytes(fileContent);
    string result = Encoding.UTF8.GetString(fileContent, 0, fileContent.Length);

    return result;
    }
    catch (Exception ex)
    {
    return "error";
    }
    }


  private async Task<HttpClient> PreparedClientAsync()
  {
   var filter = new Windows.Web.Http.Filters.HttpBaseProtocolFilter();

   filter.IgnorableServerCertificateErrors.Add(ChainValidationResult.Expired);
   filter.IgnorableServerCertificateErrors.Add(ChainValidationResult.Untrusted);
   filter.IgnorableServerCertificateErrors.Add(ChainValidationResult.InvalidName);

    HttpClient client = new HttpClient(filter);

    //I also handle other stuff here (client certificate, authentification), but the 
    lines above should allow the Httpclient to accept all certificates

    return client;
   }