title: throw new TypeError('root path required')
body: <p>i am deploying app to a remote server (dukko), and this error is thrown.
  any help or suggestion will be appreciated. </p>
  
  <pre><code>/app/node_modules/express/node_modules/serve-static/index.js:40
  remote: throw new TypeError('root path required')
  remote: ^
  remote: TypeError: root path required
  remote: at Function.serveStatic [as static] 
          (/app/node_modules/express/node_modules/serve-static/index.js:40:11)
  remote: at exports.default (/app/server/config/express.js:129:57)
  remote: at Object. (/app/server/app.js:51:28)
  remote: at Module._compile (module.js:409:26)
  remote: at Object.Module._extensions..js (module.js:416:10)
  remote: at Module.load (module.js:343:32)
  remote: at Function.Module._load (module.js:300:12)
  remote: at Function.Module.runMain (module.js:441:10)
  remote: at startup (node.js:140:18)
  remote: at node.js:1043:3
  </code></pre>
  
  <p>the only static path i am using for are.</p>
  
  <pre><code>app.use(express.static(app.get('appPath')));
  app.use('/jobseeker', express.static(process.env.JOBSEEKER_UPLOADS));
  app.use('/employer', express.static(process.env.EMPLOYER_UPLOADS));`
  </code></pre>