title: Cannot read property 'root' of null React Native iOS
body: <p>I have been facing this issue since yesterday and am unable to resolve. I have gone through all github issues filed for react native and watchman, none helped to resolve the issue. </p>
  
  <p>When I try to start react-native inside my project folder using command:</p>
  
  <p><code>react-native start</code></p>
  
  <p>Following log is thrown in terminal:</p>
  
  <blockquote>
    <p>[4:57:26 PM]  Building Dependency Graph [4:57:27 PM] 
    Crawling File System [Hot Module Replacement] Server listening on /hot</p>
    
    <p>React packager ready.</p>
    
    <p>Failed to build DependencyGraph: Watchman error: Cannot read property
    'root' of null. Make sure watchman is running for this project. See
    <a href="https://facebook.github.io/watchman/docs/troubleshooting.html" rel="nofollow">https://facebook.github.io/watchman/docs/troubleshooting.html</a>. Error:
    Watchman error: Cannot read property 'root' of null. Make sure
    watchman is running for this project. See
    <a href="https://facebook.github.io/watchman/docs/troubleshooting.html" rel="nofollow">https://facebook.github.io/watchman/docs/troubleshooting.html</a>.
        at /Users/anum/Desktop/Practice/QuizReact/node_modules/node-haste/lib/crawlers/watchman.js:63:11
        at process._tickCallback (internal/process/next_tick.js:103:7)</p>
  </blockquote>
  
  <p>I have updated both watchman and brew to latest versions. Please can someone point me towards right way to solve this problem? Thanks.</p>