title: Task exited with exit code null
body: <p>I am running into a problem of a task exiting with a null exit code. And with this exit code, I noted that I can't access files on node to check the stderr and stdout files. What could be the problem? Also, what does a null exit code mean and how can I set the exit code to be not nullin case of failure?</p>
  
  <p>Thanks!</p>