404 Detection

I do not have access to Firewall -> 404 Detection.
The error I get is:
“Not Found. The requested URL was not found on this server.”
/wp-admin/admin.php?page=aiowpsec_firewall&tab=tab6

I have been using this great plugin for a long time and for the first time I have a problem.
Please advice how I can restore access to the “404 Detection” tab.

WP ver. 5.9.3
All In One WP Security & Firewall ver. 4.4.11