title: Shiny-app error: The application failed to start. The application exited during initialization
body: <p>I have a shiny server on which I have deployed two apps.  They run fine. I tried to deploy a third app using exactly the same protocol and when I try to invoke from its url I get this error:</p>
  
  <p>The application failed to start.</p>
  
  <p>The application exited during initialization.</p>
  
  <p>I examined the file permissions for the app.R file for all three apps and they are identical.  I also see nothing in the log file (var/log/shiny-server) hat points to an obvious problem.  Any ideas?</p>