execution failed for task app:kapDebKotlin

Please, provide some logs, otherwise it’s very hard to help you. I suppose that you have some problem in your code, related to annotation processing. Also, #kapt

i use it instead annotationProcessor in my gradle

Please build your project in console with gradle and show logs (or copy them from Gradle Console, if you use Android Studio).

execution failed for task app:kapDebKotlin

means only that annotation processing failed.