SUSE Manager registration of systems fail

we are new to SUSE Manager, and we are trying to register our systems.
System ist SLES4SAP 15 SP2.
Error in bootstrap:


  • registering
    Traceback (most recent call last):
    File “/usr/lib/python3.6/site-packages/rhn/”, line 20, in
    import httplib
    ModuleNotFoundError: No module named ‘httplib’

As I’m not familiar with that Python crap, I need some help.

So the client system is running SLES4SAP 15 SP2?

Which version of SUSE Manager are you using and how are you trying to register the client?