Getting Error in Exercise 1.2. when generating in Eclipse

[Hunzlifuz]

Prerequisites:
SAP S4/HANA 2022 on Premise
Eclipse 2022/03

When i am trying to generate the repository objects out of the new table i am getting following error:
"Invalid XML format of the response. Usually this is a programming error, but occasionally this is caused by an outdated client. Details: Content ist nicht zulässig in Prolog."

The a follow-up popup with an additional error message appears, but i think this is just a side effect:
"An error has occurred. See error log for more details.
class java.lang.reflect.InvocationTargetException cannot be cast to class com.sap.adt.communication.resources.ResourceException (java.lang.reflect.InvocationTargetException is in module java.base of loader 'bootstrap'; com.sap.adt.communication.resources.ResourceException is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @6a0a0f12)"

In the tutorial you say that it should also work for onPrem. So i wonder what i am doing wrong.