Collabora Error message

Hi Boris
I accidentally reinstalled an old Collabora backup file when deleting the backup files.
After that I could no longer access tables.
I deleted the Collabora app on Syncloud and Nextcloud. Then reinstalled both. Unfortunately, I still get the following error message:

What else can I try?

Looks like something is wrong with your DNS server, can you open this url on the same machine you are trying to save this?