Hi, I've just experienced the same thing and was bummed when I came here with no answer provided.
I'm using Android Studio v2.3.1 and Kotlin v1.1.1
The currently selected Java debugger doesn't support breakpoints of type 'Kotlin Line Breakpoints'. As a result, these breakpoints will not be hit.
Turns out I wasn't really calling my code.... So nothing actually happened at all.
BUT, I still saw that line in my debugger window, so it would be cool to actually get an answer to it.