You are using some custom driver for this device. You'll need to update it to match some platform changes that were made a couple years ago or more (or switch to a different driver--there may be one built in--or use only apps that assume the "old" spec).
I'm using the custom RGBGenie driver from Bryan. There is no stock driver that I can find that will operate this device. The only other thing I am doing that might be causing this error is that I use Mirror Me
There was a lot of fan fare in the forums about these RGB Genie products, and this thing wasn't cheap. I would really like to find a way to get this working as intended.
(or a similar modification in whatever driver you're using--there should be a line that defines the setColorTemperature() method.)
This will get rid of the error but will not allow the new functionality, being able to pass a level or transition time in as part of the same command (so those options in Rule Machine, etc. won't work -- you'll have to set level as a separate action if needed). The driver should be able to be modified to actually work in this way, too, but I don't have this device and didn't dig into the driver much.