I encountered the same problem - but my catalog.php file looked different to the one in this thread (even though I am running v2.2)? It took me a while to find the instructions that related to my catalog.php, so thought I would post them here for others:
Find this code (Around Line 25):
'<a href="' . tep_href_link(FILENAME_PRODUCTS_ATTRIBUTES, '', 'NONSSL') . '" class="menuBoxContentLink">' . BOX_CATALOG_CATEGORIES_PRODUCTS_ATTRIBUTES . '</a><br>' .
Directly AFTER add this:
'<a href="' . tep_href_link('easypopulate.php', '', 'NONSSL') . '" class="menuBoxContentLink">Easy Populate</a><br>' .