can not start firewall-config

edit

Hi, I just installed firewall-config via dnf, but when starting it, I get an error messages saying that

[joachimrosenberger@ga74diq ~]$ firewall-config
Traceback (most recent call last):
  File "/usr/bin/firewall-config", line 47, in <module>
    from firewall import client
  File "/usr/lib/python3.6/site-packages/firewall/client.py", line 29, in <module>
    import slip.dbus
  File "/usr/lib/python3.6/site-packages/slip/dbus/__init__.py", line 8, in <module>
    from . import service
  File "/usr/lib/python3.6/site-packages/slip/dbus/service.py", line 34, in <module>
    from . import polkit
  File "/usr/lib/python3.6/site-packages/slip/dbus/polkit.py", line 31, in <module>
    from decorator import decorator
  ModuleNotFoundError: No module named 'decorator'

I did

dnf provides '*python-decorator*'

And found the package python-decoratortools and installed it. But the error stays the same... Any idea?