title: command "exp build:android", error "Can't find package.json"
body: <p>I run command exp build:android.
  After some minutes it displays:</p>
  
  <pre><code>[exp] Building...
  [exp] Build started, it may take a few minutes to complete.
  [exp] Build ID: (some id here)
  [exp] Run `exp build:status` to monitor it.
  </code></pre>
  
  <p>When I run command "exp build:status", I see this error:</p>
  
  <pre><code>|[exp] Error: Can't find package.json
  /[exp] There is an error with your project. See above logs for information.
  </code></pre>
  
  <p>Do you have any idea what it could be. Package.json does exist in the project.</p>
  
  <p>Update: exp is called at the project root (package.json is in same folder).
  My project was created with "Create-react-native-app".
  exp version: 46.0.3
  nodejs version v6.11.2
  npm version 3.10.10</p>