title: Call to undefined method JAdminCssMenu::load()
body: <p>I have updated joomla version from 3.6.5 to 3.7 joomla latest version.
  Now I am getting fatal error on site backend :</p>
  
  <p>Fatal error: Call to undefined method JAdminCssMenu::load() in /public_html/administrator/modules/mod_menu/mod_menu.php on line 25</p>
  
  <p>Can anyone please provide me solution to get it fixed.</p>
  
  <p>Thanks</p>