jQuery UI plugin is missing. Download and extract it into the @directory directory. Rename the extracted folder to @library-folder.', array( '@jqueryui' => 'http://jqueryui.com', '@download' => 'http://code.google.com/p/jquery-ui/downloads/list?q=1.6', '@directory' => 'sites/all/libraries', '@library-folder' => 'jquery.ui', )); $requirements['jquery_ui']['severity'] = REQUIREMENT_ERROR; } return $requirements; } /** * Implementation of hook_uninstall(). */ function jquery_ui_uninstall() { variable_del('jquery_ui_compression_type'); }