Comment utiliser un ArrayAdapter dans un fragment avec Kotlin

J'essaye de créer un Spinnerintérieur Fragmentmais j'obtiens une erreur dans l' ArrayAdapterappel du constructeur. Je ne sais pas pourquoi, mais il est souligné en rouge. A part ça, il n'y a pas d'erreur. Quand j'utilise la même chose ArrayAdapterdans un Activitycela fonctionne, mais dans un Fragment, cela donne une erreur.

Mon FirstFragment.kt:

class FirstFragment : Fragment() {

    private var mListener: OnFragmentInteractionListener? = null

    override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        // Inflate the layout for this fragment
        return inflater!!.inflate(R.layout.fragment_first, container, false)
    }

    override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        /*Find the id of spinner*/
        val spinner = lol

        /*set an adapter with strings array*/
        spinner.adapter = ArrayAdapter(this, R.layout.support_simple_spinner_dropdown_item, resources.getStringArray(R.array.atoms)) as SpinnerAdapter?

            /*set click listener*/
            spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
            override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {
                val num = when (spinner.selectedItem.toString()) {
                    "H" -> editText.setText("1")
                    "He" -> editText.setText("4")
                    "C" -> editText.setText("12")
                    "O" -> editText.setText("16")
                    else -> editText.setText("")
                }
            }

            override fun onNothingSelected(parent: AdapterView<*>) {
                /*Do something if nothing selected*/
            }
        }

        button.setOnClickListener {
            if (
                editText2.text.toString().length > 0 &&
                editText.text.toString().length > 0) {
                val num2 = editText.text.toString().toDouble()
                val num1 = editText2.text.toString().toDouble()
                val num = num1/num2
                textView.setText("$num moles")
            }
            else {
                textView.setText("Please Enter a correct value")
            }
        }
    }
}

Mon fragment_first.xml:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context="com.a3.aakap.ftrial.FirstFragment">

    <android.support.constraint.ConstraintLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">

        <TextView
            android:id="@+id/textView"
            android:layout_width="294dp"
            android:layout_height="80dp"
            android:layout_weight="1"
            android:text="Amswer : No of Moles"
            android:textAlignment="center"
            android:textSize="20sp"
            app:layout_anchorGravity="right|top"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.556" />

        <TextView
            android:id="@+id/textView1"
            android:layout_width="143dp"
            android:layout_height="46dp"
            android:layout_weight="1"
            android:text="Amount in Grams "
            android:textAlignment="center"
            android:textSize="20sp"
            app:layout_anchorGravity="left|bottom"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.066"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.305" />

        <Spinner
            android:id="@+id/lol"
            android:layout_width="145dp"
            android:layout_height="57dp"
            app:layout_anchorGravity="left|top"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.07"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.136" />

        <Button
            android:id="@+id/button"
            android:layout_width="138dp"
            android:layout_height="43dp"
            android:text="Calculate"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.788" />

        <EditText
            android:id="@+id/editText"
            android:layout_width="148dp"
            android:layout_height="57dp"
            android:ems="10"
            android:hint="Gram"
            android:inputType="numberDecimal|number"
            app:layout_anchorGravity="bottom|center"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.762"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.137" />

        <EditText
            android:id="@+id/editText2"
            android:layout_width="148dp"
            android:layout_height="57dp"
            android:ems="10"
            android:hint="Gram"
            android:inputType="numberDecimal|number"
            app:layout_anchorGravity="center_horizontal|center"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.716"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.288" />

    </android.support.constraint.ConstraintLayout>

</FrameLayout>