Openhab2 - HG-HM-LC-Sw1PBU-FM Status initializing

I am trying to get the HG-HM-LC-Sw1PBU-FM light switch with openhab2 and homegear to work.
I am using the Raspberry Pi3 with HM-MOD-RPI-PCB. Today I finally got homegear to find and pair the light switch. I even got openhab2 to find that light switch by adding as Gateway and Callback Address to the homematic:bridge. I added it to Things. Its status is “initializing” and stays that way. What am I doing wrong? Why is the status not changing to “online”? How do I proceed from here?
I hope you can help me.

problem solved!
The solution is: reboot.
Thank you anyway.