When trying to open System>Configuration>Catalog I get an error which produces the following error report:
a:5:{i:0;s:87:"Invalid config field backend model: catalog/system_config_backend_catalog_category_flat";i:1;s:1660:"#0 /var/www/html/magento/app/code/core/Mage/Adminhtml/Block/System/Config/Form.php(328): Mage::throwException('Invalid config …')
#1 /var/www/html/magento/app/code/core/Mage/Adminhtml/Block/System/Config/Form.php(229): Mage_Adminhtml_Block_System_Config_Form->initFields(Object(Varien_Data_Form_Element_Fieldset), Object(Mage_Core_Model_Config_Element), Object(Mage_Core_Model_Config_Element))
#2 /var/www/html/magento/app/code/core/Mage/Adminhtml/Block/System/Config/Form.php(164): Mage_Adminhtml_Block_System_Config_Form->_initGroup(Object(Varien_Data_Form), Object(Mage_Core_Model_Config_Element), Object(Mage_Core_Model_Config_Element))
#3 /var/www/html/magento/app/code/core/Mage/Adminhtml/Block/System/Config/Edit.php(92): Mage_Adminhtml_Block_System_Config_Form->initForm()
#4 /var/www/html/magento/app/code/core/Mage/Adminhtml/controllers/System/ConfigController.php(107): Mage_Adminhtml_Block_System_Config_Edit->initForm()
#5 /var/www/html/magento/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Adminhtml_System_ConfigController->editAction()
#6 /var/www/html/magento/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(250): Mage_Core_Controller_Varien_Action->dispatch('edit')
#7 /var/www/html/magento/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#8 /var/www/html/magento/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#9 /var/www/html/magento/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#10 /var/www/html/magento/index.php(87): Mage::run('', 'store')
#11 {main}";s:3:"url";s:90:"/index.php/admin/system_config/edit/section/catalog/key/10c99ce673e69a7ece470ddd0411f6dd/";s:11:"script_name";s:10:"/index.php";s:4:"skin";s:5:"admin";}
The only reference I could find to this online was here and it didn't work for me.
This doesn't happen with any of the other sections of the Configuration menu.
P.S. Tried Woolfie's suggestion below (see comment) and this didn't find the problem either.
Can anyone help?
Best Answer
It looks like you are missing the class
Mage_Catalog_Model_System_Config_Backend_Catalog_Category_Flat. Check if this file exists:app/code/core/Mage/Catalog/Model/System/Config/Backend/Catalog/Category/Flat.php.If it does not exist get it from a clean magento instance.