Nextcloud Office + Collabora, only error message when opening an office file

Hello,

I am just trying to get Nextcloud Office to work but I got no luck with it. The built-in Collabora server is working fine and is shown within the office settings.

I can create office files using the Nextcloud menus but I am not able to open any file. I just get an error message that opening wasn’t successfull!

I already removed Collabora and Nextcloud Office again and also removed the database entries (mentioned in another post). Same problem occurs after re-installing and re-configuration.

I just see those error messages in the logs:

GenericFileException
Rendering themed error page failed. Falling back to un-themed error page.

file_get_contents(/nextcloud/appdata_ochfuf028s7q/richdocuments/remoteData/capabilities): Failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#294

GenericFileException
Exception thrown: OCP\Files\GenericFileException

file_get_contents(/nextcloud/appdata_ochfuf028s7q/richdocuments/remoteData/capabilities): Failed to open stream: No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#294

QueryNotFoundException
Could not resolve OCA\Richdocuments\Backgroundjobs\Cleanup! Class “OCA\Richdocuments\Backgroundjobs\Cleanup” does not exist
failed to create instance of background job: OCA\Richdocuments\Backgroundjobs\Cleanup

QueryNotFoundException
Could not resolve CA\Richdocuments\Backgroundjobs\ObtainCapabilities! Class “OCA\Richdocuments\Backgroundjobs\ObtainCapabilities” does not exist failed to create instance of background job: OCA\Richdocuments\Backgroundjobs\ObtainCapabilities

I checked those paths that are mentioned in the error messages and I can tell they exist and also the permissions seems to be okay.

Anybody got an I idea what could be wrong?

OS: Newest Debian 12
Nextcloud: Directly installed on Debian (version 31.0.3)
Webserver: Apache2
Reverse Proxy: Zoraxy

Thanks for your help!

please review Collabora integration guide - this helps to resolve most integration issues