Qt: Connect list in c++ to listview in QML

I just started learning Qt. To be honest, some of confuses my a lot. I'm trying to load a predefined .csv table into a listview. I created a qml file with the simple layout of a textfield, a listview and a button to load a file. The file looks like this:

import QtQuick 2.7
import QtQuick.Controls 2.2
import QtQuick.Layouts 1.3
import QtQuick.Dialogs 1.2

ApplicationWindow {
    id: applicationWindow
    objectName: "App"
    visible: true
    width: 640
    height: 480
    title: qsTr("Rosinenpicker")

    ColumnLayout {
        id: columnLayout
        anchors.rightMargin: 40
        anchors.leftMargin: 40
        anchors.bottomMargin: 40
        anchors.topMargin: 40
        anchors.fill: parent


        TextField {
            id: name
            text: qsTr("Text Field")
            Layout.preferredHeight: 50
            Layout.fillWidth: true
        }

        ListView {
            id: list
            x: 0
            y: 0
            width: 110
            height: 160
            spacing: 0
            boundsBehavior: Flickable.DragAndOvershootBounds
            Layout.fillHeight: true
            Layout.fillWidth: true
            objectName: "listView"
            model: guestModel

            delegate: Item {
                x: 5
                width: 80
                height: 40

                Text {
                    text: model.modeldata.name
                    font.bold: true
                    anchors.verticalCenter: parent.verticalCenter
                }
            }
        }

        Button {
            id: button
            width: 50
            text: qsTr("Open File")
            Layout.preferredWidth: 100
            Layout.alignment: Qt.AlignRight | Qt.AlignVCenter

            onClicked: fileDialog.visible = true;
        }

        FileDialog {
            id: fileDialog
            title: "Please choose a valid guestlist file"
            objectName: "fileDialog"
            nameFilters: ["Valid guestlist files (*.csv)"]
            selectMultiple: false

            signal fileSelected(url path)

            onAccepted: fileSelected(fileDialog.fileUrl)
        }
    }
}

In my main file I create a CsvParser class a connect it to the fileSelected signal of the file dialog. I can parse the csv-File. But when I try to connect it to the listview, I'm lost.

The main file:

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QtDebug>
#include <QUrl>
#include <QQuickView>

#include "csvparser.h"

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QLatin1String("qrc:/main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;

    auto root = engine.rootObjects().first();
    auto fileDialog = root->findChild<QObject*>("fileDialog");

    CsvParser parser(engine.rootContext());
    QObject::connect(fileDialog, SIGNAL(fileSelected(QUrl)), &parser, SLOT(loadData(QUrl)));

    return app.exec();
}

My parser looks like this:

#include "csvparser.h"

#include <QtDebug>
#include <QFile>

#include "guest.h"

CsvParser::CsvParser(QQmlContext *context)
{
    this->context = context;
}

void CsvParser::loadData(QUrl path)
{
    friendList.clear();
    guestList.clear();

    QFile file(path.toLocalFile());
    file.open(QIODevice::ReadOnly);

    // ignore first lines
    for(int i=0; i<3; i++)
        file.readLine();

    while(!file.atEnd()) {
        auto rowCells = file.readLine().split(',');

        if(rowCells.size() != 6)
            continue;

        checkedAdd(friendList, rowCells[0], rowCells[1]);
        checkedAdd(guestList, rowCells[3], rowCells[4]);
    }

    qDebug() << guestList.size();
    auto qv = QVariant::fromValue(guestList);
    context->setContextProperty("guestModel", qv);
}

void CsvParser::checkedAdd(QList<QObject*> &list, QString name, QString familyName)
{
    if(name == "" && familyName == "")
        return;

    list.append(new Guest(name, familyName));
}

And the guest, which has only a name and a familyname looks like this:

#ifndef GUEST_H
#define GUEST_H

#include <QObject>

class Guest : public QObject
{
public:
    Q_OBJECT

    Q_PROPERTY(QString name READ name WRITE setName NOTIFY nameChanged)
    Q_PROPERTY(QString fName READ fName WRITE setfName NOTIFY fNameChanged)

public:
    Guest(QString name, QString fName);

    QString name();
    QString fName();

    void setName(QString name);
    void setfName(QString fName);

signals:
    void nameChanged();
    void fNameChanged();

private:
    QString m_name, m_fName;
};

#endif // GUEST_H

I get the following output:

qrc:/main.qml:41: ReferenceError: guestModel is not defined
QFileInfo::absolutePath: Constructed with empty filename
2
qrc:/main.qml:49: TypeError: Cannot read property 'name' of undefined
qrc:/main.qml:49: TypeError: Cannot read property 'name' of undefined

What am I doing wrong? Any help is appreciated. Thanks!