Habmin2 has no content

I hope it’s the right forum here. I have installed OH2 and then included the newest habmin jar file in the addon folder. Now I see habmin also in the OH2 start panel. But when I start habmin it’s complete empty, also my items are not in the Things folder. I can’t choose any of the files like rules or sitemaps. It’s all empty. But the item is in OH2 and I can control it from there. Why it’s not findable in habmin?

That is not the proper way to install a binding in openHAB2.
You need to install bindings from PaperUI in openHAB2.
Delete the .jar in your addons folder and install habmin via PaperUI (“Add-Ons”, “User Interfaces”).