title: Drupal 8 - Fatal error: Cannot instantiate interface Drupal\Core\Cache\CacheBackendInterface
body: <p>i received this error message when i was trying to install admin_menu in drupal 8 
  can any one else help me to resolve this error ..</p>
  
  <pre><code>Fatal error: Cannot instantiate interface Drupal\Core\Cache\CacheBackendInterface in C:\xampp5.6\htdocs\drupal-8\core\lib\Drupal\Component\DependencyInjection\Container.php on line 268
  </code></pre>