Welcome to the forum @theemuly,
most people here don’t speak German, so please set your language to English and do a new screenshot.
I’m not one of the people who don’t speak German, so I try to help you, because I can read the error message.
You have to create a green network with a static IP, for example
192.168.2.191.
The IP for Active Directory has to be at the same subnet as the server:
192.168.2.xxx
For example you can choose the IP you tried with.
But be aware that they are not at the DHCP-Range of your network.