title: pandoc document conversion failed with error 127
body: <p>I'm not sure how to make a reproducible example of this, but I'm curious to hear if anyone else has encountered this problem. I have an R Markdown file hosted via shiny server on an EC2 instance running Ubuntu. Everything was working fine for days and now suddenly I get the following error when I try to view the document in the browser:</p>
  
  <pre><code>pandoc document conversion failed with error 127
  </code></pre>
  
  <p>I'm not converting to pdf, haven't pushed any changes, and it was working a few hours ago. I'm not finding much of anything online about this error code so I have no idea how to debug this issue. Anyone had this happen before?</p>