Fail2ban command error

In today’s fail2ban log, i found one error entry like this.

: ERROR /usr/local/hestia/bin/v-delete-firewall-ban 34.180.31.228 WEB – failed with [Errno 3] No such process

But i can see another line have this IP unbanned successfully..

Then I searched through my old log, but i didnt find such error. So it only happened once.

May I know what was happening?

I started seeing the same thing in my logs.