error when going to main search settings

I've installed the D6 dev module, set the permissions, restricted some content types and node. The node was restricted from the search, but content types were not so I thought I better re-index the site. Went to /admin/settings/search/main and got the following error:
Fatal error: require_once() [function.require]: Failed opening required 'sites/all/modules/search_block/search.admin.inc' (include_path='.:/usr/share/php:/usr/share/pear') in /<webroot>/includes/menu.inc on line 346