Habmin2 doesn't ave settings

I ask that under “habmin” before, but sadly there was no response, therefore here again. I appologize if this is not the way to do that, but I still don’t find any solution.
When I create a Diagram in habmin 2 and name and save it, it doesn’t appear on the left side. There is no List with the Diagramms or Dashboards or other things designed before.
When I click on Diagramms then, I get an error:
can’t open List (Fehler beim öffnen der Liste). It seems, habmin can’t save
anything, but it does’nt tell on saving, only on reloading.
What do I have to change?
I also don’t have a habmin.cfg in the Designer under Services. Should there be one? How does it look like?