This error occurred when navigating to ‘Catalog’ -> ‘Manage Categories’. The page did not display correctly and this error could be found in the page by using ‘view source’.
A temporary ‘hack’ fix was found here: http://www.naveenos.com/2011/01/fatal-error-call-to-undefined-method-mage_adminhtml_block_widgetgetrowurl-in-magneto-1-4-2.html
Tags: magento