plugin amr-users problem

I am a real novice to WordPress and Plugins, having taken over for a Webmaster no longer available as a resource.

Can someone give some insight to a problem now being experienced with plugin “amr-users”

I’ve updated from:
from amr-usres 4.26 to 4.56
and
from WordPress 5.2.11 to 5.7.2
and
from PHP 5.6.4 to 7.4.15

and now I am getting these errors:
Warning: asort() expects parameter 1 to be array, null given in /home/omgc/www/www/wordpress/wp-content/plugins/amr-users/includes/ameta-includes.php on line 420

Warning: Invalid argument supplied for foreach() in /home/omgc/www/www/wordpress/wp-content/plugins/amr-users/includes/ameta-includes.php on line 422

Warning: Invalid argument supplied for foreach() in /home/omgc/www/www/wordpress/wp-content/plugins/amr-users/includes/ameta-includes.php on line 268

Warning: Invalid argument supplied for foreach() in /home/omgc/www/www/wordpress/wp-content/plugins/amr-users/includes/ameta-includes.php on line 427

What else can I provide to anyone who might be able to help me??

• This topic was modified 3 years, 8 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Everything else WordPress topic

The page I need help with: [log in to see the link]