I found a solution in the following thread (it is in french): Renew LE certificat - Error: [Errno 22]
It is due to the fact I have a dynamic IPv4 address and this is not handle in YUNoHost.
I had to execute the following command:
yunohost service regen-conf dnsmasq
Now I can renew my LE certificat.
But installing a new certificate for another domain does not work.