error: LNK2019: unresolved external symbol " [QBarSet] [clean + qmake + rebuild don't fix the problem]

Josz

note: 
clean + qmake + rebuild don't fix the problem
I use msvc2015 32 bits

Hi community,
I’m trying to create a class to insert a bar chart into MainWindow, but in the moment that I try to use a QBarSet pointer, i obtain from compiler the error below:

mybars.obj:-1: error: LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall QtCharts::QBarSet::QBarSet(class QString,class QObject *)" (__imp_??0QBarSet@QtCharts@@QAE@VQString@@PAVQObject@@@Z) referenced in function "public: __thiscall myBars::myBars(void)" (??0myBars@@QAE@XZ)

mybars.obj:-1: error: LNK2001: unresolved external symbol "public: virtual struct QMetaObject const * __thiscall myBars::metaObject(void)const " (?metaObject@myBars@@UBEPBUQMetaObject@@XZ)

debug\my_HorBarras_v01.exe:-1: error: LNK1120: 9 unresolved externals

Please, could someone explain me why I obtain this issue and how to fix it?
Thanks in advance

here are my codes

mybars.h

#ifndef MYBARS_H
#define MYBARS_H
#include <QtWidgets/QApplication>
#include <QtWidgets/QMainWindow>
#include <QtCharts/QChartView>
#include <QtCharts/QBarSeries>
#include <QtCharts/QBarSet>
#include <QtCharts/QLegend>
#include <QtCharts/QBarCategoryAxis>
#include <QtCharts/QHorizontalStackedBarSeries>

QT_CHARTS_USE_NAMESPACE
class myBars
{
public:
    myBars();
    ~myBars();

private:
 QBarSet *set0;
};

#endif // MYBARS_H

mybars.cpp

#include "mybars.h"
myBars::myBars()
{
 set0= new QBarSet("my");
  *set0 << 1 << 10;
}

myBars::~myBars()
{
   delete set0;
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <mybars.h>
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private:
    Ui::MainWindow *ui;
    myBars *bars;
};

#endif // MAINWINDOW_H

mywindow.cpp

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

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setFixedSize(1024,768);
    bars = new myBars;
}

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

Christian Ehrlicher

Do you also link against the QtCharts module? https://doc.qt.io/qt-5.11/qtcharts-index.html

Josz

Thank you very much!!!
That was!!