Create New Rule and select 2 RGB devices
Select Means to Activate as a Transition over 30 seconds every 5 seconds
Select Setup Lighting Periods and go to select color and pick green and BOOM you get:
I think I know what is causing this, and it's clearly getting bad values from the devices. Show the Current States of those devices from their device page.
This has nothing to do with transitions. It has to do with the device not having its attributes set. You need to solve the device problem first. I have no clue, not my area of knowledge.
Ya me either and the actual Green and Red Sub-Device turn on and off as green and red just fine. Like I said not that big a deal. I'll just not worry about it. Thanks for taking a look.
Without ever setting any attribute? That's not right. Room Lights uses device.currentLevel, device.currentHue, device.currentSaturation to function. Without those, it can't do its thing, and certainly couldn't run a transition.
Meanwhile, I know how to prevent the error from blowing up the app instance. Although fixing it wouldn't be enough for a transition to work right.
Dunno. I know if I go to the driver for Green click on green it comes on in green and the same for red. I'm more lost than you on this. I am trying something if it works I'll be back.