Error on constructor

Hi everyone,
i always get this error when i compile :
'Viewer' has not been declared

My viewer.h and modultreewidget.h are in the same directory.

MODULTREEWIDGET:

Code:

---

#ifndef MODULTREEWIDGET_H
#define MODULTREEWIDGET_H
 
#include <QWidget>
#include <QTreeWidget>
#include <QTimer>
#include "viewer.h"
#include "basewidget.h"
 
class ModulTreeWidget : public QTreeWidget
{
    Q_OBJECT
public:
    explicit ModulTreeWidget(QTreeWidget *parent=0,Viewer *v=0);
    ~ModulTreeWidget();
    void addModule(BaseWidget *b);
public slots:
    void startPresentation();
    void showNext();
private:
    std::vector<BaseWidget*> baseWidgets;
    int count;
    int currentId;
};
 
#endif // MODULTREEWIDGET_H

---

VIEWER:

Code:

---

#ifndef VIEWER_H
#define VIEWER_H
 
#include <QMainWindow>
#include <QWidget>
#include <QVBoxLayout>
#include <QLabel>
#include <QDebug>
#include <QStringList>
#include <QInputDialog>
#include <QString>
#include <QMessageBox>
#include <QVector>
#include <QListWidget>
#include <QListWidgetItem>
#include <QTableWidgetItem>
#include <QList>
#include <QItemSelectionModel>
#include <QModelIndexList>
#include "basewidget.h"
#include "tabledialog.h"
#include <QTreeWidget>
#include <QTreeWidgetItem>
#include <vector>
#include <QDesktopWidget>
#include <QColorDialog>
#include "modultreewidget.h"
 
namespace Ui {
class Viewer;
}
 
class Viewer : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit Viewer(QWidget *parent = 0);
    ~Viewer();

---

What´s the problem?

Try to reduce the includes inside headers by forward declaring classes that are only needed as pointers.

For example in modultreewidget.h you only need QTreeWidget.

Right now you have a circular dependency of viewer.h and modultreewidget.h

Cheers,
_