title: Invalid value for 'manifest_version'. Must be an integer greater than zero
body: <pre><code>{
      "name": "Park_School",
      "version":"2",
      "manifest_version":"2",
      "icons": { "128": "128.png" },
      "app": {
          "urls": [
               "http://vle.parkcommunity.devon.sch.uk/"
          ],
          "launch": {
               "web_url": "http://vle.parkcommunity.devon.sch.uk/"
          }
      }
  }
  </code></pre>
  
  <p>Obviously the manifest version is greater than zero but google chrome says it's not. Help?</p>