Fatal error: Uncaught Error: Call to undefined method Mage_Catalog_Model_Resource_Category_Flat_Collection::getAllIdsSql() in /var/www/magento/app/code/core/Mage/Catalog/Model/Resource/Category/Tree.php:295 Stack trace: #0 /var/www/magento/app/code/core/Mage/Catalog/Model/Resource/Category/Tree.php(242): Mage_Catalog_Model_Resource_Category_Tree->_getInactiveItemIds(Object(Mage_Catalog_Model_Resource_Category_Flat_Collection), '1') #1 /var/www/magento/app/code/core/Mage/Catalog/Model/Resource/Category/Tree.php(154): Mage_Catalog_Model_Resource_Category_Tree->_getDisabledIds(Object(Mage_Catalog_Model_Resource_Category_Flat_Collection)) #2 /var/www/magento/app/code/core/Mage/Catalog/Model/Resource/Category.php(576): Mage_Catalog_Model_Resource_Category_Tree->addCollectionData(Object(Mage_Catalog_Model_Resource_Category_Flat_Collection), false, Array, true, true) #3 /var/www/magento/app/code/core/Mage/Catalog/Model/Category.php(818): Mage_Catalog_Model_Resource_Category->getCategories('2', 2, false, false, true) #4 /var/www/ in /var/www/magento/app/code/core/Mage/Catalog/Model/Resource/Category/Tree.php on line 295