Instead of Graphs | Error messages are displayed on email notification of checkmk

Hi @andreas-doehler/@anonymous15

Yes the graphs are coming correctly inside PNP4Nagios.
I checked into PHP file , below is the screenshot, but please give me the command:

Also , one thing running in my mind is if I do systemctl status nagios, it comes failed
OMD[checkmk]:~/tmp/php/session$ systemctl status nagios
● nagios.service - Nagios
Loaded: loaded (/etc/systemd/system/nagios.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Thu 2021-01-14 16:15:10 CET; 6 days ago
Main PID: 13819 (code=exited, status=217/USER)
OMD[checkmk]:~/tmp/php/session$

And if I go omd status , here nagios is running
OMD[checkmk]:~/tmp/php/session$ omd status
mkeventd: running
rrdcached: running
npcd: running
nagios: running
apache: running
crontab: running

Overall state: running
OMD[checkmk]:~/tmp/php/session$

So can this be the reason for red error coming in the notification intermittently for the Checkmk service?

BR
/Prachi