I want to make it so that when I click on a button from the main menu, a new form opens (not as a dialog, but is replaced with a new form). I created the history.ui form. I also created history.hpp and history.cpp. I’m getting errors in history.cpp.

history.hpp

#ifndef HISTORY_HPP
#define HISTORY_HPP

#include <QDialog>

namespace Ui {
class History;
}

class History : public QDialog
{
    Q_OBJECT

public:
    explicit History(QWidget *parent = nullptr);
    ~History();

private:
    Ui::History *ui;
};

#endif // HISTORY_HPP

mainwindow.hpp

#ifndef MAINWINDOW_HPP
#define MAINWINDOW_HPP

#include <QMainWindow>
#include "history.hpp"

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_pushButton_3_clicked();

private:
    Ui::MainWindow *ui;
    History *historyDialog;
};

#endif // MAINWINDOW_HPP

history.cpp

#include "history.hpp"
#include "ui_history.h"

History::History(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::History)
{
    ui->setupUi(this);
}

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

enter image description here
I tried rebuilding the project, but I’m still getting errors.

I added all the files to CMakeLists.txt. ChatGPT says that the ui_history.h file is generated automatically.

Ubuntu 24.04 LTS.
QT Creator 13.02.