Duck DNS e crontab -e PROBLEM!

Hello everyone,
I state that I have recently entered the home assistant world and I am amazed and enthusiastic.
It is my intention to configure duckdns to display my home assistant outside as well.

I followed the guidance from the duckDNS site for “pi” but I did a half trouble: having difficulty entering the special character “*”, and getting error messages, I deleted the contents of the crontab -e file.
I copied the line necessary for duckdns to work, that is

* / 5 * * * * ~ / duckdns / duck.sh> / dev / null 2> & 1

but when you do the test it gives me OK for the configuration. Only when I launch crontab with the command

sudo service cron start

the error it returns to me is
s6 service not found for cron, exiting ...

how can i solve?
Many thanks in advance!!!

Same problem here
Did you solve?