28.0.2 no access to apps

Nextcloud version: 28.0.2
Operating system and version: Linux 5.4.0-171-generic x86_64
Apache or nginx version (eg, Apache 2.4.25): ?
PHP version: 8.2.16

I have set up a current Nextcloud instance 28.0.2 and unfortunately I cannot access the “Apps” tab (Login – Nextcloud) and therefore cannot manage my apps.

I already had the problem with the last version and hoped that a system reset would solve the problem - unfortunately this did not happen

The output of Nextcloud log in Admin > Logging:
NotPermittedException Could not create folder “/appdata_ochac8r7f52x/theming/global”
However, the folder “/appdata_ochac8r7f52x/theming/global” exists under “data” and was therefore created
the permissions of my root directory are 755

I am very happy about your help and thank you in advance for it

Correct user e.g. www-data and group www-data? Comare with other dirs and files.

What happens when you so? What do you see in your browser?

Sorry I don‘t understand your point can you explain me More Details?

My Browser is completly white if I click to „Apps“