2.0.4-rc1 : An unknown error occured

After update release 2.0.4-rc1 ikea light bulb not working anymore. When i want to turn on a light bulb an unknown error shows up. (See screenprint)

A Flow with the same ikea bulb work fine. Restarting the homey didn’t solve the problem.

Any help would be great

https://support.athom.com/hc/en-us/requests/new