QMainWindow not found

Question

using the following configuration

• VM: Debian 12 ARM64
• IDE: Visual Studio Code
• Compiler: g++ 12.2
• Framework: Qt6

I created my first source example in Qt6 with the following code

CMakeLists.txt (New version)

cmake_minimum_required(VERSION 3.5)

project(Test2 VERSION 0.1 LANGUAGES CXX)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

set(CMAKE_PREFIX_PATH "/usr/lib/aarch64-linux-gnu/cmake/Qt6")

find_package(Qt6 REQUIRED COMPONENTS Widgets)

set(PROJECT_SOURCES
        main.cpp
        mainwindow.cpp
        mainwindow.h
        mainwindow.ui
)

qt_add_executable(Test2 MANUAL_FINALIZATION ${PROJECT_SOURCES})

target_link_libraries(Test2 PRIVATE Qt6::Widgets)

qt_finalize_executable(Test2)

mainwindow.cpp

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

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

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

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

during compilation, the error appears

QMainWindow: File or directory does not exist

 4 | #include <QMainWindow>
   | ^~~~~~~~~~~~~ 

compilation terminated.

can you help me ? Thank you all

My first example in Qt6