Symptoms
Plesk update fails or Plesk panel cannot be accessed with the following message:
PHP Fatal error: Class LaminasServiceManagerServiceLocatorInterface cannot implement previously implemented interface PsrContainerContainerInterface in /opt/psa/admin/plib/modules/monitoring/vendor/laminas/laminas-servicemanager/src/ServiceLocatorInterface.php on line 18
Cause
The outdated version of the Monitoring extension is installed on the server.
Resolution
-
Update the Monitoring extension to the latest version with the command below in the SSH console or CMD/Windows Powershell:
# plesk bin extension --upgrade monitoring