title: Always errors - The "path" argument must be one of type string, Buffer, or URL. Received type undefined
body: <p>I've made a bunch of changes to my app that I didn't think had anything to do with mustache, and suddenly every single page I try to render gives this error.</p>
  
  <pre><code>The "path" argument must be one of type string, Buffer, or URL. Received type undefined
  at Object.readFile (fs.js:297:3)
  at read (/home/malcolm/complice/node_modules/hogan-express/hogan-express.js:32:14)
  at renderPartials (/home/malcolm/complice/node_modules/hogan-express/hogan-express.js:58:7)
  </code></pre>