RaspberryMatic VM with no RF-Modul (hm-wired only) works, but openHAB-Binding cannot connect

I run a RaspberryMatic VM (OVA in Proxmox) with no attached RF-Modul and only HM-Wired Devices.
This works perfectly, but openHAB fails to communicate with the VM. All i get is a “org.xml.sax.SAXException: Unknown XML-RPC tag: title” Error.
If I restore it on a RaspberryPi with a attached RF-Module, everything works fine as expected.