title: Mage_Core_Model_App' not found magento XAMPP
body: <p>I am setting up magento on my mac in XAMPP server but when I hit the url:</p>
  
  <p><a href="http://localhost/magento/" rel="nofollow">http://localhost/magento/</a></p>
  
  <p>I get a error message :</p>
  
  <p>Fatal error: Class 'Mage_Core_Model_App' not found in /Applications/XAMPP/xamppfiles/htdocs/magento/app/Mage.php on line 636</p>
  
  <p>does any one know what exactly issue?
  thanks in advance.</p>