Service error “… has no zero argument constructor”

_x000D_ _x000D_ I want start a service, I use: inner class HomeService : Service() { override fun onBind(intent: Intent?): IBinder? { return null } override fun onCreate() { super.onCreate() } override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int { notification(light.toString()) return START_STICKY } override fun onDestroy() { super.onDestroy() } } start it: val i = Intent(this@Main3Activity, HomeService()::class.java) startService(i) after my app crashed, logcat return: java.lang.Class has no zero argument constructor at android.app.ActivityThread.handleCreateService(ActivityThread.java:3201) at android.app.ActivityThread.-wrap5(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1586) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6186) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779) Caused by: java.lang.InstantiationException: java.lang.Class has no zero argument constructor at java.lang.Class.newInstance(Native Method) at android.app.ActivityThread.handleCreateService(ActivityThread.java:3198) at android.app.ActivityThread.-wrap5(ActivityThread.java)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1586)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:154)  at android.app.ActivityThread.main(ActivityThread.java:6186)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779) what should I do?