title: Object reference not set to an instance of an object in Microsoft Bot Framework
body: <p>Hi I am working on Microsoft Bot Framework and in that I am working QnAMaker with including LUIS application.</p>
  
  <p>Here my question is when I am working QnAMaker its providing the Exact answer and when I am adding the LUIS service I am getting the Exact answer in debugging and when I am providing the reply to the user by using <code>await context.PostAsync(answer);</code> its by default going to the exception section and its showing exception is like below.</p>
  
  <blockquote>
    <p>Object reference is not set be instance of object.</p>
  </blockquote>
  
  <p>Here I can't understand where is the null is occurred because of I am getting the data from QnAMaker.</p>
  
  <p>In the below I am sharing the code what I have write for getting the response to user form QnAMaker after the LUIS identify the Intents and Entities</p>
  
  <pre><code>private async Task toGetTheResponsefromQnAMakerAsync(IDialogContext context, Activity activity)
      {
          var messagetext = (activity.Text).ToLower();
          var knowledgebaseId = ConfigurationManager.AppSettings["KnowledgeBaseId"];
  
          //Use subscription key assigned to you.
          var qnamakerSubscriptionKey = ConfigurationManager.AppSettings["QnAmakerSubscriptionKey"];
          var client = new HttpClient();
          var queryString = HttpUtility.ParseQueryString(string.Empty);
  
          // Request headers
          client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", qnamakerSubscriptionKey);
  
          var uri = "https://westus.api.cognitive.microsoft.com/qnamaker/v2.0/knowledgebases/subscription-id/generateAnswer?" + queryString;
  
          HttpResponseMessage response;
  
          // Request body
     byte[] byteData = Encoding.UTF8.GetBytes($"{{\"question\": \"{messagetext}\"}}");
  
          using (var content = new ByteArrayContent(byteData))
          {
              content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
              response = await client.PostAsync(uri, content);
          }
          try
          {
              if (response.IsSuccessStatusCode)
              {
                  var responseContent = response.Content.ReadAsStringAsync().Result;
  
                  var QnAMakerResponse = JsonConvert.DeserializeObject&lt;RootObject&gt;(responseContent);
  
                  if (QnAMakerResponse.answers != null)
                  {
                      foreach (var item in QnAMakerResponse.answers)
                          // return our QnAMakerResponse to the user
                          answer = item.answer.ToString();
                          await context.PostAsync(answer);
  
                  }
              }
          }
          catch (Exception e)
          {
  
          }
      }
  </code></pre>