The group "404 Errors" has disappeared after upgrade to plugin V2.3.3

Hi,
The group “404 Errors”, in the admin screen of the plugin, has disappeared permanently after upgrading this plugin to V2.3.3

Screenshot: https://dl.dropboxusercontent.com/u/5629939/temp/Group%20missing%20after%20WP%20Redirection%20plugin%20upgrade%20to%20V2.3.3.jpg

Admin url: https://www.website.com/wp-admin/tools.php?page=redirection.php&sub=modules

Please help how I can restore that group so I can monitor the http-404-not-found errors of the website.

Thanks for your time,
Rolf.

https://www.ads-software.com/plugins/redirection/