调用DialogFragment

Question

   override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {

        val rootview = inflater.inflate(R.layout.fragment_products, container, false)

        val addProductsDialogFragment = AddProductsDialogFragment()
        fab.setOnClickListener {
            addProductsDialogFragment.show(fm, "tag")
        }

        return rootview
    }

当我致电addProductsDialogFragment.show(fm, "tag")时，他们向我显示了此问题：

  

未解决的参考：AddProductsDialogFragment