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Plesk can not be updated or is not accessible: Class Laminas\ServiceManager\ServiceLocatorInterface cannot implement previously implemented interface

Symptoms

Plesk update fails or Plesk panel cannot be accessed with the following message:

PHP Fatal error: Class Laminas\ServiceManager\ServiceLocatorInterface cannot implement previously implemented interface Psr\Container\ContainerInterface 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The outdated version of the Monitoring extension is installed on the server.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

  1. Connect to the server via SSH/RDP.

  2. 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

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