Nextcloud App got broken somehow

[fil]

What type of hardware are you using: Raspberry Pi 3, 4+
What YunoHost version are you running: 12.0.17
How are you able to access your server: The webadmin
SSH
Are you in a special context or did you perform specific tweaking on your YunoHost instance ?: No

Describe your issue

Hi all,
I have a problem with my nextcloud app.
I have only updated the system and nc is still at 30.0 as I am waiting for an app to become available for 31.
Nextcloud complains that there is no .ncdata faile there but it is (and also .ocdata).
Checked the app in the gui and get following (sorry it’s only a screenshot as the popup window won’t close and allow me to copy the text):

It seems that a yaml-file has got corrupted somehow.
I’d be really grateful for any help.

Best regards from Germany
Fil

Share relevant logs or error messages

I can’t find the log required but there’s a screenshot of the result when checking the nextcloud app per GUI

[otm33]

Hello @fil
Have you checked your Nextcloud config file for errors? sudo cat /var/www/nextcloud/config/config.php, especially for datadirectory ?

[fil]

Thanks for that.
I checked the directory where my Nextcloud files should be and… Nothing
It turns out that the USB stick has died totally…
sorry for bothering you all with this.
best regards from Germany
Fil