Wrong argument type for 'x' in argument bundle. string expected

How can I fix this problem when I use putStringArrayList in the bundle? Here my code:

Handler().postDelayed({
    val b = Bundle()
    b.putStringArrayList("list_1", ls1)
    b.putStringArrayList("list_2", ls2)
    b.putString("letter", mBigLetters()[position])

    Navigation.findNavController(activity!!, R.id.nav_host_v2).navigate(R.id.ABListVerbs, b)
}, 300)