Fatal error: Uncaught Error: Call to undefined method Mage_Catalog_Model_Product_Type_Simple::getUsedProducts() in /var/www/essentiel/app/code/core/Mage/Catalog/Model/Resource/Product/Type/Configurable/Attribute/Collection.php:160 Stack trace: #0 /var/www/essentiel/app/code/core/Mage/Catalog/Model/Resource/Product/Type/Configurable/Attribute/Collection.php(126): Mage_Catalog_Model_Resource_Product_Type_Configurable_Attribute_Collection->_addAssociatedProductFilters() #1 /var/www/essentiel/lib/Varien/Data/Collection/Db.php(587): Mage_Catalog_Model_Resource_Product_Type_Configurable_Attribute_Collection->_afterLoad() #2 /var/www/essentiel/app/code/core/Mage/Catalog/Model/Product/Type/Configurable.php(260): Varien_Data_Collection_Db->load() #3 /var/www/essentiel/app/code/core/Mage/Catalog/Model/Product/Type/Configurable.php(337): Mage_Catalog_Model_Product_Type_Configurable->getConfigurableAttributes(Object(Essentiel_Extensions_Model_Catalog_Product)) #4 /var/www/essentiel/app/design/frontend/essentiel/essentiel/template/soc in /var/www/essentiel/app/code/core/Mage/Catalog/Model/Resource/Product/Type/Configurable/Attribute/Collection.php on line 160