Android onClick not working

Mobile App Development
#1 
<Button
        android:id="@+id/createBirthdayButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="60dp"
        android:text="@string/create"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/nameInput"
        android:padding="30dp"
        android:textColor="@color/colorPrimaryDark"
        android:clickable="true"
        android:onClick="createBirthdayCard"/>

fun createBirthdayCard(view: View) {
        Toast.makeText(this, "Button",Toast.LENGTH_LONG).show()
    }

On clicking, toast does not show.