Error "Type: 'zonelist'" when executing a request

Symptoms

When logging into the ispmanager panel, creating websites, users or opening the “System Settings” section, the following message appears:
"An error occurred while executing the request"

While in the main log of the panel /usr/local/mgr5/var/ispmgr.log the following entry is registered:

libmgr ERROR Error: Type: 'zonelist'

Also, while running a timedatectl command in the console, one of the messages is shown:

• Failed to create bus connection: No such file or directory
• Failed to create bus connection: Connection refused
• System has not been booted with systemd as init system (PID 1). Can't operate. Failed to create bus connection: Host is down
   

Causes

The server is experiencing issues with the initialization system or system services required for correct operation of the ispmanager panel.

Solution

First of all, it's necessary to check the status of the "dbus" service by entering the following command:

systemctl status dbus

In case service status in the terminal output is anything other than "running", try rebooting the operating system. Restarting "dbus" manually is usually not possible due to idiosyncrasy of its configuration.
In more complicated cases, to debug the system services ask an operating system administration specialist for assistance.

The error may also occur while using WSL. The panel has not been tested for correct operation with this system. We recommend installing ispmanager on one of the native supported operating systems.