title: How to fix the connection to the server was unsuccessful. (file ///android_asset/www/index.html)
body: <p>I've added material icons to ionic2 app , and since then I get error ""The connection to the server was unsuccessful. (file:///android_asset/www/index.html)"" 
  although the css and fonts file of MaterialIcons are in the assets folder (I've install it locally) there is no call to "<a href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="noreferrer">https://fonts.googleapis.com/icon?family=Material+Icons</a>"
  what can I do ? Can I fix it or know why the timeout suddenly . </p>