Warning: include(Mage/Core/Model/Config/Base.php) [function.include]: failed to open stream: No such file or directory in /home/magmaria/public_html/magento/lib/Varien/Autoload.php on line 93

Warning: include() [function.include]: Failed opening 'Mage/Core/Model/Config/Base.php' for inclusion (include_path='/home/magmaria/public_html/magento/app/code/local:/home/magmaria/public_html/magento/app/code/community:/home/magmaria/public_html/magento/app/code/core:/home/magmaria/public_html/magento/lib:.:/usr/lib/php') in /home/magmaria/public_html/magento/lib/Varien/Autoload.php on line 93

Fatal error: Class 'Mage_Core_Model_Config_Base' not found in /home/magmaria/public_html/magento/app/code/core/Mage/Core/Model/Config.php on line 36