title: Viewpager fragment doesn't running functionally
body: <p>I am now trying to implement viewpager with fragment. Everything is cool except i got error <strong>ViewPager has not been bound.
  Exception details are logged in Window > Show View > Error Log</strong> in xml graphical layout.</p>
  
  <p>And Here's a screenshot of my application.
  <img src="https://i.stack.imgur.com/kDI2L.png" alt="ViewPager"></p>
  
  <p>Does anyone know why there is not showing indicator line below title ?</p>