Assert uint(i) < uint(size()) in file qstring.h line 933

cuteqq

I am learning Qt and I copied this code from a book. The program did not compile and resulted in the error below:

Desktop_Qt_5_11_1_MSVC2017_64bit-Debug\debug\RSS_Reader...
QML debugging is enabled. Only use this in a safe environment.
ASSERT: "uint(i) < uint(size())" in file c:\users\qt\work\qt\qtbase\src\corelib\tools\qstring.h, line 933

I am attaching the files in the project, there is literally no code, just QML files. Please help !

main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QFont>

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

#ifdef Q_OS_WIN
    app.setFont(QFont(QString("Times New Roman")));
#endif

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}

main.qml

import QtQuick 2.3
import QtQuick.Window 2.2
import QtQuick.XmlListModel 2.0
import QtQuick.Controls 1.2
import QtQuick.Controls.Styles 1.2
import "qrc:/"

Window {
    id: mainWindow
    visible: true
    width: 720
    height: 400
    flags: Qt.Window | Qt.FramelessWindowHint

    TitleBar {
        id: titleBar
    }

    Text {
        id: windowTitle
        anchors { left: titleBar.left; leftMargin: 10; verticalCenter: titleBar.verticalCenter }
        text: "BBC News Reader"
        color: "#FFF"
        font.pointSize: 10
    }

    Feeds {
        id: categoriesModel
    }

    ListView {
        id: categories

        orientation: ListView.Vertical
        spacing: 3
        model:categoriesModel
        delegate: CategoriesDelegate {
            id: categoriesDelegate
            width: categories.width
        }
        property string currentUrl: categoriesModel.get(0).url
    }

    ScrollView {
        id: categoriesView
        contentItem: categories
        anchors { left: parent.left; top: titleBar.bottom; bottom: parent.bottom; }
        width: 0.2 * parent.width
        style: ScrollViewStyle {
            transientScrollBars: true
        }
    }

    XmlListModel {
        id: newsModel

        source: categories.currentUrl
        namespaceDeclarations: "declare namespace media = 'http://search.yahoo.com/mrss/'; declare namespace atom = 'http://www.w3.org/2005/Atom';"
        query: "/rss/channel/item"

        XmlRole { name: "title"; query: "title/string()" }
        XmlRole { name: "description"; query: "description/string()" }
        XmlRole { name: "link"; query: "link/string()" }
        XmlRole { name: "pubDate"; query: "pubDate/string()" }
        //XPath starts from 1 not 0 and the second thumbnail is larger and more clear
        XmlRole { name: "thumbnail"; query: "media:thumbnail[2]/@url/string()" }
    }

    ScrollView {
        id: newsView
        anchors { left: categoriesView.right; leftMargin: 10; right: parent.right; top: titleBar.bottom; bottom: parent.bottom }
        style: ScrollViewStyle {
            transientScrollBars: true
        }
        ListView {
            id: newsList
            model: newsModel
            delegate: NewsDelegate {
                width: newsList.width
            }
        }
    }

    BusyIndicator {
        anchors.centerIn: newsView
        running: newsModel.status == XmlListModel.Loading
    }
}

CategoriesDelegate.qml

import QtQuick 2.3

Rectangle {
    id: delegate
    height: 80

    property bool selected: ListView.isCurrentItem

    Text {
        id: title
        anchors { left: parent.left; leftMargin: 10; right: parent.right; rightMargin: 10 }
        anchors.verticalCenter: delegate.verticalCenter
        text: name
        font { pointSize: 18; bold: true }
        verticalAlignment: Text.AlignVCenter
        wrapMode: Text.WordWrap
        scale: selected ? 1.0 : 0.8
        color: selected ? "#000" : "#AAA"
        Behavior on color { ColorAnimation { duration: 300 } }
        Behavior on scale { PropertyAnimation { duration: 300 } }
    }

    MouseArea {
        anchors.fill: delegate
        onClicked: {
            categories.currentIndex = index
            if(categories.currentUrl == url)
                newsModel.reload()
            else
                categories.currentUrl = url
        }
    }
}

Feeds.qml

import QtQuick 2.3

ListModel {
    ListElement { name: "Top Stories"; url: "http://feeds.bbci.co.uk/news/rss.xml" }
    ListElement { name: "World"; url: "http://feeds.bbci.co.uk/news/world/rss.xml" }
    ListElement { name: "UK"; url: "http://feeds.bbci.co.uk/news/uk/rss.xml" }
    ListElement { name: "Business"; url: "http://feeds.bbci.co.uk/news/business/rss.xml" }
    ListElement { name: "Politics"; url: "http://feeds.bbci.co.uk/news/politics/rss.xml" }
    ListElement { name: "Health"; url: "http://feeds.bbci.co.uk/news/health/rss.xml" }
    ListElement { name: "Education & Family"; url: "http://feeds.bbci.co.uk/news/education/rss.xml" }
    ListElement { name: "Science & Environment"; url: "http://feeds.bbci.co.uk/news/science_and_environment/rss.xml" }
    ListElement { name: "Technology"; url: "http://feeds.bbci.co.uk/news/technology/rss.xml" }
    ListElement { name: "Entertainment & Arts"; url: "http://feeds.bbci.co.uk/news/entertainment_and_arts/rss.xml" }
}

NewsDelegate.qml

import QtQuick 2.3

Column {
    id: news
    spacing: 8

    //used to seperate news item
    Item { height: news.spacing; width: news.width }

    Row {
        width: parent.width
        height: children.height
        spacing: news.spacing

        Image {
            id: titleImage
            source: thumbnail
        }

        Text {
            width: parent.width - titleImage.width
            wrapMode: Text.WordWrap
            font.pointSize: 20
            font.bold: true
            text: title
        }
    }

    Text {
        width: parent.width
        font.pointSize: 9
        font.italic: true
        text: pubDate + " (<a href=\"" + link + "\">Details</a>)"
        onLinkActivated: {
            Qt.openUrlExternally(link)
        }
    }

    Text {
        width: parent.width
        wrapMode: Text.WordWrap
        font.pointSize: 10.5
        horizontalAlignment: Qt.AlignLeft
        text: description
    }
}

Titlebar.qml

import QtQuick 2.3

Row {
    id: titlebar
    width: parent.width
    height: 22
    layoutDirection: Qt.RightToLeft

    property point mPos: Qt.point(0,0)

    Image {
        id: closebutton
        width: 22
        height: 22
        fillMode: Image.PreserveAspectFit
        source: "qrc:/close.png"

        MouseArea {
            anchors.fill: parent
            onClicked: {
                Qt.quit()
            }
        }
    }

    Rectangle {
        width: titlebar.width - closebutton.width
        height: titlebar.height
        color: "#000"

        MouseArea {
            anchors.fill: parent
            onPressed: {
                mPos = Qt.point(mouseX, mouseY)
            }
            onPositionChanged: {
                mainWindow.setX(mainWindow.x + mouseX - mPos.x)
                mainWindow.setY(mainWindow.y + mouseY - mPos.y)
            }
        }
    }
}