title: your app has entered a break state, but there is no code to show because all threads were executing external code in xamarin android
body: <p>this is a piece of  my code in xamarin android , When Vs 2017 want to execute the line "await Task.Delay(200);" , the error mentioned in title will apear, please tell me if anybody know about that</p>
  
  <pre><code>private async void _btnanswer2_Click(object sender, EventArgs e)
      {
          if(Ans == 2)
          {
              _btnanswer2.SetBackgroundColor(Android.Graphics.Color.ParseColor("#006400"));
              mScore = mScore + 1;
              _txtscore.Text = "امتیاز: " + mScore.ToString();
          }
          else
          {
              _btnanswer2.SetBackgroundColor(Android.Graphics.Color.ParseColor("#FF0000"));
          }
          await Task.Delay(200); //Error after Execute this line
       _btnanswer2.SetBackgroundColor(Android.Graphics.Color.ParseColor("0091EA"));
          bandeira++;
          RefreshQue();
      }
  </code></pre>