title: xamarin navigate from one fragment to another
body: <p>I am trying to navigate from on fragment to another by click a button in original fragment. How ever I got a Exception </p>
  
  <p><a href="http://i.stack.imgur.com/uqiLk.png" rel="nofollow">Image of exception</a></p>
  
  <p><a href="http://i.stack.imgur.com/x7OWN.png" rel="nofollow">Image of my code for the original Fragment</a></p>