Roundcube version is 1.6.1. Other plugins like twofactor_gauthenticator works fine. But the newmail_notifier plugin does not make sound, neither give other notifications.
When I tried visit
https://mail.myhostname.com?_action=plugin.newmail_notifier, I saw "SERVER ERROR!Error No. [524]".
Roundcube logs as the following:
[15-May-2023 09:52:54 +0800]: PHP Error: No handler found for action plugin.newmail_notifier in /var/www/html/roundcubemail/program/lib/Roundcube/rcube_plugin_api.php on line 579 (GET /?_action=plugin.newmail_notifier)
I have tried Chrome as well as Edge, they are both the same. Anyone can help me?