tailwatchd fails to start with The “NOTIFY_SOCKET” environment variable is empty. at /usr/local/cpanel/Cpanel/Systemd/Notify.pm line 424.

Symptoms

tailwatchd is unable to start with the following error:

 The “NOTIFY_SOCKET” environment variable is empty. at /usr/local/cpanel/Cpanel/Systemd/Notify.pm line 424.

Description 

This has been found to be caused by an incorrectly set Type for systemd configuration for queueprocd. 

Workaround

Modify /etc/systemd/system/tailwatchd.service and change:

Type=forking

to instead be:

Type=notify

Then run:

systemctl daemon-reload
/scripts/restartsrv_tailwatchd