Roundcube Mail - Server Error! (Internal Server Error)

Hello everyone,
I'm currently using PHP 7.4 and Roundcube 1.5.8 - CWP CentOS 7
When I access the Mail page, I get the error shown in the title.
I checked the Log and found an error:

Stack trace:
#0 /usr/local/cwpsrv/var/services/roundcube/program/actions/mail/index.php(1372): rcube_spoofchecker::check('server.t...')
#1 /usr/local/cwpsrv/var/services/roundcube/program/actions/mail/index.php(524): rcmail_action_mail_index::address_string('root@server.t', 3, false, NULL, NULL)
#2 /usr/local/cwpsrv/var/services/roundcube/program/actions/mail/list.php(125): rcmail_action_mail_index::js_message_list(Array, false, Array)
#3 /usr/local/cwpsrv/var/services/roundcube/program/include/rcmail.php(275): rcmail_action_mail_list->run(Array)
#4 /usr/local/cwpsrv/var/services/roundcube/index.php(283): rcmail->action_handler()
#5 {main}
thrown in /usr/local/cwpsrv/var/services/roundcube/program/lib/Roundcube/rcube_spoofchecker.php on line 50

I have temporarily disabled the Spoofchecker function by adding the following: return false; and it is temporarily working:
return false;
// Spoofchecker is part of ext-intl (requires ICU >= 4.2)
$checker = new Spoofchecker();

Is there a way to handle this without disabling the function?
Thank you.

Roundcube requires the INTL extension. See these directions:
https://www.alphagnu.com/topic/33-update-cwp-roundcube-mail-version-158-%E2%80%93-control-web-panel/
(And consider updating to the last LTS version: 1.5.15 (you can follow the directions from AlphaGNU, but update the version number from 1.5.8 to 1.5.15 in all cases.)