Problem Install Collabora

Hi all

I install Collabora CODE from Software Center and after perform this step i found on:
https://docs.nethserver.org/it/v7/collabora.html

The steps i perfom are this:

I have install the packet “Collabora CODE” from the software center

config setprop coolwsd VirtualHost collabora.yourdomain.com
signal-event nethserver-collabora-update

I request Let’s Encrypt Certificate for the FQDN of the Nethserver and collabora.yourdomain.com btw the domain is the same

But i have this error: