Installing ZM on Raspberry Pi 4 8GB - problems with API

[miguelfree]

Hi,
I just installed Zoneminder 1.34 on my Raspberry Pi 4 8GB. I started with the Imager from RasperryPi.
I did the installation exactly as described in the manual.
I also added an hdd like in the Youtube video.
I set the timezone.
So the webinterface is fine and no error in the logs.

As I dont have a camera yet I just wanted to test the installation and wanted to test the connection with zmNinja. I couldnt connect.
After a while I noticed that the API is not working. If I go to http://<serverip>/zm/api/host/getVersion.json there is just an error message.

So my question is: Is it possible that I have to install something additional if I install ZM on a rasperrypi (64bit raspi bullseye image)?

If yes, what is it, and if no, where can I start to troubleshoot?
Or is the API working if once a camera has installed?

Thank you,
Michael

[miguelfree]

I started from scratch with Ubuntu. Everything is working now.
I also could connect a local webcam to test the system.
So, I dont know what it was with the raspi image, but with ubuntu is it working