错误类型不匹配：推断的类型是<未提供名称>

Question

我遇到以下错误：

  

“类型不匹配：推断的类型为，但   PlaceSelectionListener？被期望“？

private fun setupAutoCompleteFragment() 
{  
 val autocompleteSupportFragment =       supportFragmentManager.findFragmentById(R.id.place_autocomplete_fragment) as AutocompleteSupportFragment

        autocompleteSupportFragment.setOnPlaceSelectedListener(object : PlaceSelectionListener {
            override fun onPlaceSelected(place: Place) {
                showPlace(getString(R.string.autocomplete_fragment), place)
            }

            override fun onError(status: Status) {
                showResponse("An error occurred: $status")
            }
        })
    }