Z-wave update error

[ERROR] [st.core.internal.thing.ThingResource] - Exception during HTTP PUT request for update config at ‘things/zwave:device:1590aeb5569:node12/config’ for thing ‘zwave:device:1590aeb5569:node12’: null

2017-10-09 06:56:43.048 [WARN ] [org.openhab.io.net.http.HttpUtil ] - Method failed: HTTP/1.1 500 Internal Server Error

I have this error, when I try to update z-wave properties from PaperUi or Habmin. Any ideas how I can troubleshoot this ?

Another problem is DZMX1-1LZ update to OH is delayed. Everything works as expected if I control DZMX1 devices from OH, but if I manually push the button OH item gets update in about 15 minutes.

I am using OH2.1 on ubuntu. I have another OH installation on Mac, and z-wave update works fine.

Still looking for help with DZMX1-1LZ. I have 3 switches and only one acting weird.