So this started…
Please enable debug logging and add that output to the above; explain how you are sending the command (show your rule or custom app?); show whether you are using Z-Wave JS (check if Settings > Z-Wave Details has a "Switch to Legacy" button, as one way to tell); and verify which driver you are using (it's apparently custom and looks a lot like mine, but this would be necessary to know).
NVM I just looked at the log and I see I am trying to set the color to 'null'
Sometimes I tinker and I have no idea why I removed those variables. Thanks for making me use my brain
I added the variables back and no errors any longer. Thanks for humoring me.