title: Could not load assembly on Xamarin.Forms?
body: <p>While rebuilding my android project it shows this error:</p>
  
  <pre><code>System.IO.FileNotFoundException: Could not load assembly 'Xamarin.Android.Support.Fragment, 
  Version=1.0.0.0, Culture=neutral, PublicKeyToken='. Perhaps it doesn't exist in the Mono for Android profile?
  </code></pre>
  
  <p>Then I installed 'Xamarin.Android.Support.Fragment' but it fails to install
  and shows this error:</p>
  
  <pre><code>Unable to resolve dependencies. 'Xamarin.Android.Support.v4 23.3.0' is not compatible with 
  'Xamarin.Android.Support.Design 23.3.0 constraint: Xamarin.Android.Support.v4 (= 23.3.0)', 
  'Xamarin.Forms 2.5.0.91635 constraint: Xamarin.Android.Support.v4 (&gt;= 25.4.0.2)'
  </code></pre>
  
  <p>How to solve this problem?</p>
  
  <p>I am using API Version 15 (Android 4.0.3).
  After installing API Version 25 (Android 7.1) it shows the same error.</p>