Hi Pascal,
When the Komento app is used with JDownloads v4.1.1, the following error appears. The issue is resolved when the com_jdownloads.php file located at /components/com_komento/komento_plugins is disabled. Please check.
Features:
Joomla v6.0.3
PHP 8.3.30
MySQLi 8.4.8
JA Template & T3 Framework
JDownloads v4.1.1