GroupFolders and BackgroundJob: Failed to remove item from trashbin

I observe many messages in nextcloud.log which relate to the GroupFolders application.

{"reqId":"hX9nevWIGDhBGcb636TV","level":3,"time":"2022-08-14T01:01:20+00:00","remoteAddr":"","user":"--","app":"core","method":"","url":"--","message":"Error while running background job (class: OCA\\GroupFolders\\BackgroundJob\\ExpireGroupTrash, arguments: )","userAgent":"--","version":"24.0.3.2","exception":{"Exception":"Exception","Message":"Failed to remove item from trashbin","Code":0,"Trace":[{"file":"/var/www/owncloud/apps/groupfolders/lib/BackgroundJob/ExpireGroupTrash.php","line":58,"function":"expire","class":"OCA\\GroupFolders\\Trash\\TrashBackend","type":"->"},{"file":"/var/www/owncloud/lib/public/BackgroundJob/Job.php","line":79,"function":"run","class":"OCA\\GroupFolders\\BackgroundJob\\ExpireGroupTrash","type":"->"},{"file":"/var/www/owncloud/lib/public/BackgroundJob/TimedJob.php","line":95,"function":"execute","class":"OCP\\BackgroundJob\\Job","type":"->"},{"file":"/var/www/owncloud/cron.php","line":151,"function":"execute","class":"OCP\\BackgroundJob\\TimedJob","type":"->"}],"File":"/var/www/owncloud/apps/groupfolders/lib/Trash/TrashBackend.php","Line":394,"message":"Error while running background job (class: OCA\\GroupFolders\\BackgroundJob\\ExpireGroupTrash, arguments: )","CustomMessage":"Error while running background job (class: OCA\\GroupFolders\\BackgroundJob\\ExpireGroupTrash, arguments: )"}}

Nextcloud version: 24.0.3
Group Folders: 12.0.1
Operating system and version: Debian 11
Apache: 2.4.54-1~deb11u1
PHP version: 7.4.30

My config.php:

<?php
$CONFIG = array (
  'instanceid' => 'o...d',
  'passwordsalt' => 'R...k',
  'secret' => 'G...C',
  'trusted_domains' => 
  array (
    0 => '***.univ-fcomte.fr',
    1 => '***.***.univ-fcomte.fr',
    2 => '******.univ-fcomte.fr',
    3 => '***-api.univ-fcomte.fr',
    4 => '1xx.2xx.1xx.xx',
  ),
  'default_phone_region' => 'FR',
  'datadirectory' => '/var/www/nextcloud_data',
  'overwrite.cli.url' => 'https://***.univ-fcomte.fr/',
  'dbtype' => 'pgsql',
  'version' => '24.0.3.2',
  'dbname' => '***',
  'dbhost' => 'localhost',
  'dbtableprefix' => 'oc_',
  'dbuser' => '***',
  'dbpassword' => '***',
  'installed' => true,
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'filelocking.enabled' => 'true',
  'memcache.distributed' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => 'localhost',
    'port' => 6379,
    'timeout' => 0,
    'dbindex' => 0,
  ),
  'mail_smtpmode' => 'smtp',
  'mail_from_address' => '***',
  'mail_domain' => 'univ-fcomte.fr',
  'mail_smtphost' => '***.univ-fcomte.fr',
  'mail_smtpport' => '25',
  'theme' => '',
  'maintenance' => false,
  'session_lifetime' => 432000,
  'trashbin_retention_obligation' => '30, 60',
  'updatechecker' => false,
  'log_type' => 'file',
  'logfile' => '/var/log/nextcloud/nextcloud.log',
  'loglevel' => 3,
  'app_install_overwrite' => 
  array (
    0 => 'fulltextsearch',
    1 => 'fulltextsearch_elasticsearch',
    2 => 'user_usage_report',
    3 => 'bookmarks_fulltextsearch',
    4 => 'groupfolders',
  ),
);

no error in /var/log/apache2/error.log

Thanks in advance for any help.

Ernest.