Thank you for the hint.
I was searching since my last post and found these posts: Couldn't install any bindings in OH2 - #2 by rlkoshak
I made the mistake to delete both mentioned folders and not only the content…:(
The result was that openhab did not start at all. The folders were created after two reboots and now openhab is back up 
I wanted to check your hint to bundle:uninstall but there must be another problem now…it was so nice that everything worked before exept some error messages… 
Starting http://<ip-address>:8080/start/index there is following loader without end after 30min:
“Please stand by while UIs are being installed. This can take several minutes”
First I thought it must be something with the rights of the folders but there are newly created files in the folder.
I searched different articles but I did not change any java settings, time settings,…
Also after some reboots no ending and the UIs are not accessable.
karaf messages are ok like before the folder deleting
bundle:list does not say anything about “…hue…” from errors above
openhab.log says:
[WARN ] [org.apache.felix.fileinstall ] - Error while starting bundle: file:/volume1/homes/openhab2/addons/org.openhab.binding.lgwebos-2.2.0-SNAPSHOT.jar
org.osgi.framework.BundleException: Could not resolve module: org.openhab.binding.lgwebos [10]
Unresolved requirement: Import-Package: org.eclipse.jdt.annotation; resolution:=“optional”
Unresolved requirement: Import-Package: org.eclipse.smarthome.core.library.types
Unresolved requirement: Import-Package: org.eclipse.smarthome.config.discovery
Update on Sun, 19.11. I finally reinstalled the OpenHab with the newest snapshot for my Synology DS216play with
and everything works fine now 