Fatal error: Uncaught Error: Class 'Mage_Page_Block_Html_Head' not found in /var/www/html/app/code/core/Mage/Core/Model/Layout.php:491 Stack trace: #0 /var/www/html/app/code/core/Mage/Core/Model/Layout.php(437): Mage_Core_Model_Layout->_getBlockInstance('Mage_Page_Block...', Array) #1 /var/www/html/app/code/core/Mage/Core/Model/Layout.php(472): Mage_Core_Model_Layout->createBlock('page/html_head', 'head') #2 /var/www/html/app/code/core/Mage/Core/Model/Layout.php(239): Mage_Core_Model_Layout->addBlock('page/html_head', 'head') #3 /var/www/html/app/code/core/Mage/Core/Model/Layout.php(205): Mage_Core_Model_Layout->_generateBlock(Object(Mage_Core_Model_Layout_Element), Object(Mage_Core_Model_Layout_Element)) #4 /var/www/html/app/code/core/Mage/Core/Model/Layout.php(206): Mage_Core_Model_Layout->generateBlocks(Object(Mage_Core_Model_Layout_Element)) #5 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Action.php(344): Mage_Core_Model_Layout->generateBlocks() #6 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Act in /var/www/html/app/code/core/Mage/Core/Model/Layout.php on line 491