watchdog error

I cannot enable watchdog because i have this error:

Unable to process /opt/psa/etc/modules/watchdog/monitrc.tpl configuration file:
/opt/psa/var/modules/watchdog/data/monitrc.chk:19: Error: the executable does not exist '/bin/systemctl'
/opt/psa/var/modules/watchdog/data/monitrc.chk:20: Error: the executable does not exist '/bin/systemctl'