I am making a project for a school project, and im getting this error

Qt Code: 
  1. error: ISO C++ forbids declaration of ‘mainScreenDLG’ with no type
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from my code

Qt Code: 
  1. #ifndef __MAIN_H__
  2. #define __MAIN_H__
  3. #include <QMainWindow>
  4. #include <QApplication>
  5. #include <QPushButton>
  6. #include <cstdlib>
  7. #include "ui_menuScreen.h"
  8.  
  9.  
  10. 	// connects the code to the UI
  11. 	class mathsGame : public :: QDialog, private Ui::mainScreenDLG
  12. 	{
  13. 		Q_OBJECT
  14.  
  15. 	public:
  16. 		// makes a new instance of the main dialog
  17. 		mainScreenDLG(QDialog *parent = 0);
  18.  
  19.  
  20.  
  21. 	}
  22.  
  23.  
  24. #endif
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