rule action is simple:
Set color: Blue Level: 75
Strangely enough, I can use the same command in button controller with no issue. So, for now, I created a virtual button device and am using button controller to invoke the command.
Edit: I also got this error trying to save the button controller for the action, but I was able to page back and then it saved:
app:51862018-11-28 09:36:43.639 pm errorgroovy.lang.MissingMethodException: No signature of method: java.lang.String.call() is applicable for argument types: (java.util.HashMap) values: [[p:2]] Possible solutions: wait(), any(), wait(long), each(groovy.lang.Closure), any(groovy.lang.Closure), take(int) (mainPage)