Chapter 18, CityUI needs module installation

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Chapter 18, CityUI

On page 656, the module is not installed

::: TODO How to install the module? :::

The call to install must be added to main.cpp ?

#include <QApplication>
#include <QQmlApplicationEngine>

#include "fileio.h"

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

    QQmlApplicationEngine engine;

    FileIO* user = new FileIO(&app);
    qmlRegisterSingletonInstance("org.example.io", 1, 0, "User", user);

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

    return app.exec();
}

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After this, error is

QQmlApplicationEngine failed to load component
qrc:/main.qml:77:9: TableViewColumn is not a type

it seems TableViewColumn in not on Qt6

How can you do a book about Qt6 with APIs not in Qt6?

https://stackoverflow.com/questions/64403258/tableview-replacement-for-tableviewcolumn-in-qt-quick-2