I am unable to start harmony activities from openHAB after upgrading to 2.4.0.M4. 2018-10-04 20:20:22.131 [ome.event.ItemCommandEvent] - Item 'SZHub_Activity' received command Kodi 2018-10-04 20:20:22.139 [nt.ItemStatePredictedEvent] - SZHub_Activity predicted to become NULL ==> /var/log/openhab2…

Found the problem. The binding still works correctly, it was just my HarmonyHub changed its IP address. After correcting the ip adress problem everything works again. Sorry for the inconvenience.