- Uninstalled Airplay Bridge => Unchecking it in Plugins + Restarting Squeezebox server
- Removed the RaopBridge directory itself (not only the files inside) in /var/lib/squeezeboxserver/cache/InstalledPlugins/Plugins
- Installed RaopBridge again
- Restarted Squeezebox server
Somehow it wont start.
Doing that did not help: