unit zabbix-agent.service is masked

When i try to start/restart/stop/status the zabbix-agent service. I get the following error. I precise that I have made an install and then purged - removed it to install another version (upgrade). and since that I get this error:

Failed to start zabbix-agent.service: unit zabbix-agent.service is masked.

Solution 1:

Try to unmask zabbix-agent service?

systemctl unmask zabbix-agent.service