title: TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received type undefined raised when starting react app
body: <p>I'm working on a project in React and ran into a problem that has me stumped.</p>
  
  <p>Whenever I run <code>yarn start</code> I get this error: </p>
  
  <blockquote>
    <p>TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type
    string. Received type undefined</p>
  </blockquote>
  
  <p>I have no idea why this is happening, if anyone has experienced this I would be grateful.</p>