Set path of PolyLine from the c++ file

GGG03

I am trying to change the path from c++, sending the list from the mainwindow. But it isn't working. Any help?
The error is "QML MapPolyline: Unsupported path type"

mainwindow.h

signals:
        void setCenter(QVariant, QVariant);
        void addMarker(QVariant, QVariant);
        void setMarkers(QVariantList);

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QQuickItem>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    ui->quickWidget->setSource(QUrl(QStringLiteral("qrc:/map.qml")));
    ui->quickWidget->show();

    auto obj = ui->quickWidget->rootObject();
    connect(this, SIGNAL(setCenter(QVariant, QVariant)), obj, SLOT(setCenter(QVariant,QVariant)));
    connect(this, SIGNAL(addMarker(QVariant, QVariant)), obj, SLOT(addMarker(QVariant,QVariant)));
    connect(this, SIGNAL(setMarkers(QVariantList)), obj, SLOT(setMarkers(QVariantList)));

    emit setCenter(-28, 153.3658);
    emit addMarker(-28, 153.3658);

    QVariantList coordinates;
    coordinates.append(-29);
    coordinates.append(153);
    coordinates.append(-27);
    coordinates.append(154);
    emit setMarkers(coordinates);
}

MainWindow::~MainWindow()
{
    delete ui;
}

map.qml

import QtQuick 2.0
import QtLocation 5.6
import QtPositioning 5.6

Rectangle
{
    id: window

    property double oldLat: 27.6585
    property double oldLng: 153.3658
    property var coordinateList: []

    property Component comMarker: mapMarker

    Plugin
    {
        id: mapPlugin
        name: "osm"
    }

    Map
    {
        id: mapView
        anchors.fill: parent
        plugin: mapPlugin
        center: QtPositioning.coordinate(oldLat, oldLng);
        zoomLevel: 3

        MapPolyline
        {
            id: coordinatePath
            line.width: 2
            line.color: 'blue'
            smooth: true
            opacity: 0.8
            path: [coordinateList]
        }
    }

    Component
    {
        id: mapMarker
        MapQuickItem
        {
            id: markerImg
            anchorPoint.x: image.width/4
            anchorPoint.y: image.height
            coordinate: position
            sourceItem: Image
            {
                id: image
                source: "http://maps.gstatic.com/mapfiles/ridefinder-images/mm_20_red.png"
            }
        }
    }

    function setMarkers (list)
    {
        coordinateList = list;
    }

    function setCenter(lat, lng)
    {
        mapView.pan(oldLat - lat, oldLng - lng)
        oldLat = lat
        oldLng = lng
    }

    function addMarker(lat, lng)
    {
        var item = comMarker.createObject(window, {coordinate: QtPositioning.coordinate(lat, lng)})
        mapView.addMapItem(item)
    }

}