title: how to resolve The message filter indicated that the application is busy. (Exception from HRESULT: 0x8001010A (RPC_E_SERVERCALL_RETRYLATER))
body: <pre><code>PowerPoint.Application PowerPoint_App;
  PowerPoint_App = new PowerPoint.ApplicationClass();
  PowerPoint_App.DisplayAlerts = PowerPoint.PpAlertLevel.ppAlertsNone;
  PowerPoint.Presentation presentation;
  presentation = null;
  try
  {
      PowerPoint_App.Visible = MsoTriState.msoTrue;
      presentation = PowerPoint_App.Presentations.Open(strPptFilePath, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoFalse, Microsoft.Office.Core.MsoTriState.msoFalse);
      PowerPoint.Slide tempSlide = null;
      int totalSlides = presentation.Slides.Count;
      int slideNo = 0;
  </code></pre>
  
  <p>I am getting the below exception on <code>PowerPoint_App.Presentations.Open</code> code.</p>
  
  <blockquote>
    <p><strong>Exception Message:</strong> The message filter indicated that the application is busy. (Exception from HRESULT: 0x8001010A (RPC_E_SERVERCALL_RETRYLATER))</p>
  </blockquote>
  
  <p>I did not received this error previously on this block of code. Everything was working perfectly before. Can anyone help?</p>