OpenHAB2 on Synology - 503 Jersey is not ready


I am beginner with home automatization and I would kindly ask you for your help.
I have Synology DS214se with DMS Update 2, AeoTec USB Z-Wave stick and thermostat Heatit.
I need help with installation OH2 on Synology. I installed Java8 and OH2 2.00.007-SNAPSHOT-DSM6. To folder addons I copied habmin.jar.

I can start OH2 and get to startpage with Paper UI, Basic UI, Classic UI and Habmin UI. I choose some UI but when I select Paper or Habmin UI I´ll get error message “Error503 (Jersey is not ready yet!)”.

What does the error message mean? How can I fix it? Can you help me?