[Custom Admin Bar] Custom Admin Bar Deprecated Function Errors

Another legacy product here, but I need help eliminating the Admin Bar related errors we are getting in our server logs:

[22-Apr-2019 18:10:53 UTC] PHP Deprecated: Non-static method Wdcab_AdminPages::serve() should not be called statically in /home/account/public_html/wp-content/plugins/custom-admin-bar/custom-admin-bar.php on line 131

Please see replies for notes and relative screenshots.

Thank you!