Hi Markus,
My problem was, that my first binding, I put on the Raspi somehow had some errors with the libs. I knew that and removed the old one and put the new one on the raspi. My problem was that openhab cached the old binding, even though I deleted it. So openhab started every time the old binding with the errors from the cache instead of the new binding I put in the addons folder. I haven’t noticed that for a long time. As I noticed I solved the problem by resetting the cache and the openhab build. After that it worked. Every time you change your binding and put the new one on your raspi you have to reset the cache again. I did this as described by Thomas Binder, the fourth post in that forum. Clear the Cache.
I hope I could help you.
Martin