Warning: include_once(Mage/Core/functions.php): failed to open stream: No such file or directory in /home/nts/public_html/store/app/Mage.php on line 49

Warning: include_once(): Failed opening 'Mage/Core/functions.php' for inclusion (include_path='/home/nts/public_html/store/app/code/local:/home/nts/public_html/store/app/code/community:/home/nts/public_html/store/app/code/core:/home/nts/public_html/store/lib:.:/usr/lib/php:/usr/local/lib/php') in /home/nts/public_html/store/app/Mage.php on line 49

Warning: include(Mage/Core/Model/App.php): failed to open stream: No such file or directory in /home/nts/public_html/store/lib/Varien/Autoload.php on line 93

Warning: include(): Failed opening 'Mage/Core/Model/App.php' for inclusion (include_path='/home/nts/public_html/store/app/code/local:/home/nts/public_html/store/app/code/community:/home/nts/public_html/store/app/code/core:/home/nts/public_html/store/lib:.:/usr/lib/php:/usr/local/lib/php') in /home/nts/public_html/store/lib/Varien/Autoload.php on line 93

Fatal error: Class 'Mage_Core_Model_App' not found in /home/nts/public_html/store/app/Mage.php on line 669