Signal and "already defined" error

[QPlace]

I have a strange problem: there is a method "onprogress" in the class below. During link I am getting an error of it being already defined. When I remove "signals:" keyword it compiles OK. What might be the offence? (Windows, vs2008)

class btprogress : public QDialog
{
	Q_OBJECT
 
public:
	btprogress (nbt& nt, boost::gregorian::date mindate, boost::gregorian::date maxdate, 
	QWidget*parent = 0);
	~btprogress();
 
signals:
	void onprogress(QString date);
 
private slots:
	void onbtcanceled();
	void oncancel();
}

class btprogress : public QDialog
{
	Q_OBJECT

public:
	btprogress (nbt& nt, boost::gregorian::date mindate, boost::gregorian::date maxdate, 
	QWidget*parent = 0);
	~btprogress();

signals:
	void onprogress(QString date);

private slots:
	void onbtcanceled();
	void oncancel();
}

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