Problems after Update to 3.13

Hi There,

Since ever the automatic update is not working with my webhoster Strato. I was updating manually to 3.13. and am facing the following errors in the settings tab. Can someone give advise?

Best
Thomas

WARNING: /mnt/web004/a0/63/522063/htdocs/web/Matomo/vendor/composer/ClassLoader.php(444): Warning - include(/mnt/web004/a0/63/522063/htdocs/web/Matomo/vendor/composer/…/…/plugins/ExamplePlugin/Archiver.php): failed to open stream: No such file or directory - Matomo 3.13.0 - Please report this message in the Matomo forums: https://forum.matomo.org (please do a search first as it might have been reported already) (Module: Referrers, Action: getReferrerType, Method: Referrers.getReferrerType, In CLI mode: false)

WARNING: /mnt/web004/a0/63/522063/htdocs/web/Matomo/vendor/composer/ClassLoader.php(444): Warning - include(): Failed opening ‘/mnt/web004/a0/63/522063/htdocs/web/Matomo/vendor/composer/…/…/plugins/ExamplePlugin/Archiver.php’ for inclusion (include_path=’/mnt/web004/a0/63/522063/htdocs/web/Matomo/vendor/pear/pear_exception:/mnt/web004/a0/63/522063/htdocs/web/Matomo/vendor/pear/console_getopt:/mnt/web004/a0/63/522063/htdocs/web/Matomo/vendor/pear/pear-core-minimal/src:/mnt/web004/a0/63/522063/htdocs/web/Matomo/vendor/pear/archive_tar:.:/opt/RZphp72/includes’) - Matomo 3.13.0 - Please report this message in the Matomo forums: https://forum.matomo.org (please do a search first as it might have been reported already) (Module: Referrers, Action: getReferrerType, Method: Referrers.getReferrerType, In CLI mode: false)