I have the following code in file mainwindow.h:

Qt Code: 
  1. #ifndef MAINWINDOW_H
  2. #define MAINWINDOW_H
  3.  
  4. #include <QMainWindow>
  5. #include "logindialog.h"
  6.  
  7. namespace Ui {
  8. class MainWindow;
  9. }
  10.  
  11. class MainWindow : public QMainWindow
  12. {
  13.     Q_OBJECT
  14.  
  15. private:
  16.     Ui::MainWindow *ui; 
  17.     LoginDialog *logindialog;
  18.  
  19. public:
  20.     explicit MainWindow(QWidget *parent = 0);
  21.     ~MainWindow();
  22.  
  23. private slots:
  24.     void ALogin_Clicked();
  25.     void LoginDialog_Destroyed();
  26.  
  27. };
  28.  
  29. #endif // MAINWINDOW_H
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Other related files:
logindialog.cpp
logindialog.h
mainwindow.cpp

Everything works fine, until I put ANY changes into logindialog.cpp file. When I do, I get the following error in line 17:

Qt Code: 
  1. c:\users\mati\komunikator_klient_da_ze\mainwindow.h:17: błąd:C2143: syntax error : missing ';' before '*'
  2. c:\users\mati\komunikator_klient_da_ze\mainwindow.h:17: błąd:C4430: missing type specifier - int assumed. Note: C++ does not support default-int
  3. c:\users\mati\komunikator_klient_da_ze\mainwindow.h:17: błąd:C4430: missing type specifier - int assumed. Note: C++ does not support default-int
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The problem can easily be fixed, by removing line 17, recompliling the project (which gives even more errors) and then putting that line back. Everything will work fine, until I change logindialog.cpp again.
While it doesn't make it impossible to continue the project, it makes it very annoying...
The IDE I use is QtCreator 2.4.1

Could someone please help me?