Form problem

[dusza]

Hi,

I want to append line in textBrowser in one of my forms in application, but I can't simply type myForm[index]->m_ui->textBrowser->append(textToSet) because I get compile error mainwindow.cpp:109: error: invalid use of incomplete type ‘struct Ui::Form’
form.h:7: error: forward declaration of ‘struct Ui::Form’

here is form.h code:

#ifndef FORM_H
#define FORM_H
 
#include <QtGui/QWidget>
 
namespace Ui {
    class Form;
}
 
class Form : public QWidget {
    Q_OBJECT
    Q_DISABLE_COPY(Form)
public:
    explicit Form(QWidget *parent = 0);
    virtual ~Form();
    int userid;
    QString user_name;
    QString textToShow;
 
public:
    virtual void changeEvent(QEvent *e);
 
public:
    Ui::Form *m_ui;
 
public slots:
    void on_pushButton_clicked();
};
 
#endif // FORM_H

#ifndef FORM_H
#define FORM_H

#include <QtGui/QWidget>

namespace Ui {
    class Form;
}

class Form : public QWidget {
    Q_OBJECT
    Q_DISABLE_COPY(Form)
public:
    explicit Form(QWidget *parent = 0);
    virtual ~Form();
    int userid;
    QString user_name;
    QString textToShow;

public:
    virtual void changeEvent(QEvent *e);

public:
    Ui::Form *m_ui;

public slots:
    void on_pushButton_clicked();
};

#endif // FORM_H

To copy to clipboard, switch view to plain text mode 

I spent lot of time trying to fix it but I could not find the reason.