mapToItem: type const QQuickItem for argument 0 cannot be resolved

import QtQuick
import QtQuick.Controls.Material
import QtQuick.Layouts

ApplicationWindow {
    id: window
    width: 640
    height: 480
    visible: true
    title: qsTr("Test")

    ColumnLayout {
        id: column
    }

    Button {
        id: btn
        text: "Click me"
        onClicked: {
            var pos = btn.mapToItem(column, 1.0, 1.0);
            //console.log("Dummy: " + pos);
        }
    }
}

[4/7 18.2/sec] Generating .rcc/qmlcache/androtest_main_qml.cpp
Warning: main.qml:20:27: Could not compile binding for onClicked: No matching override found. Candidates:
Function expects 5 arguments, but 3 were provided
Function expects 2 arguments, but 3 were provided
type const QQuickItem for argument 0 cannot be resolved
Function expects 2 arguments, but 3 were provided [compiler]
            var pos = btn.mapToItem(column, 1.0, 1.0);
                          ^^^^^^^^^