QtQuick.Controls": Cannot protect module QtQuick.Controls 2 as it was never registered

import QtQuick 2.12
import QtQuick.Controls 2.12
import QtQuick.Window 2.12

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
    objectName: "appwin"

    Column {
        spacing: 20
        Button {
            text: "Show Dialog1"
            objectName: "button1"
            onClicked: dialog1.open()
        }

        Button {
            text: "Opens dialog2"
            Dialog {
                id: dialog2
                title: "Dialog2"
                objectName: "dialog2"
                x: 100
                y: 200
                width: 200
                height: 200
                focus: true
                closePolicy: Popup.CloseOnEscape | Popup.NoAutoClose

                Component.onCompleted: print(parent)

                MouseArea {
                    objectName: "MouseArea2"
                    onClicked: dialog2.forceActiveFocus()
                    width: 200
                    height: 200
                    Text {
                        text: dialog2.activeFocus ? "has active focus" : ""
                    }
                    focus: true
                    Keys.onPressed: console.log("dialog2 key pressed 0x" + event.key.toString(16))
                }
            }
        }
    }

    Dialog {
        id: dialog1
        objectName: "dialog1"
        title: "Dialog1"
        x: 200
        y: 100
        width: 200
        height: 200
        focus: true
        closePolicy: Popup.CloseOnEscape | Popup.NoAutoClose
        MouseArea {
            onClicked: dialog1.forceActiveFocus()
            objectName: "MouseArea1"
            focus: true
            width: 200
            height: 200
            Text {
                text: dialog1.activeFocus ? "has active focus" : ""
            }

            Keys.onPressed: console.log("dialog1 key pressed 0x" + event.key.toString(16))
        }
    }
}