Executable path is not absolute, ignoring: kill -HUP $MAINPID

[bkrajendra]

configuration: CentOs 7.8.2003
I have installed pagekite using yum install pagekite

I have started using pagekite recently.
It's the best tunneling system for my IoT devices.

I am getting into one issue, where I need to restart pagekite frontend on my centos 7 server frequently.
the error I am getting is:

[/usr/lib/systemd/system/pagekite.service:10] Executable path is not absolute, ignoring: kill -HUP $MAINPID

Also find the complete status below:

Redirecting to /bin/systemctl status pagekite.service
● pagekite.service - PageKite makes localhost servers visible to the world
   Loaded: loaded (/usr/lib/systemd/system/pagekite.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Thu 2020-09-24 03:16:56 IST; 7h ago
     Docs: man:pagekite(1)
           http://www.pagekite.net
 Main PID: 2261 (code=exited, status=1/FAILURE)

systemd[1]: Starting PageKite makes localhost servers visible to the world...
systemd[1]: Can't open PID file /var/run/pagekite.pid (yet?) after start: No such file or directory
systemd[1]: Started PageKite makes localhost servers visible to the world.
systemd[1]: [/usr/lib/systemd/system/pagekite.service:10] Executable path is not absolute, ignoring: kill -HUP $MAINPID
systemd[1]: [/usr/lib/systemd/system/pagekite.service:10] Executable path is not absolute, ignoring: kill -HUP $MAINPID
systemd[1]: pagekite.service: main process exited, code=exited, status=1/FAILURE
systemd[1]: Unit pagekite.service entered failed state.
systemd[1]: pagekite.service failed.

I have a single remote node connected to this front end.