Error Comes in connet the signal and slot.

[ashishsaryar]

QGraphicsBlockItem::QGraphicsBlockItem(QRectF rt,QGraphicsItem *parent)
                   : QGraphicsItem(parent)
{
	setHandlesChildEvents(true);
        m_rtBlock = rt;
	m_bOnlyOnce	= true;
	myparent = parent;
	setSelected (true ) ;
	connect ( this , SIGNAL ( groupRectItems() ), parent , SLOT( groupedRectBlock() ) );
}

QGraphicsBlockItem::QGraphicsBlockItem(QRectF rt,QGraphicsItem *parent)
                   : QGraphicsItem(parent)
{
	setHandlesChildEvents(true);
        m_rtBlock = rt;
	m_bOnlyOnce	= true;
	myparent = parent;
	setSelected (true ) ;
	connect ( this , SIGNAL ( groupRectItems() ), parent , SLOT( groupedRectBlock() ) );
}

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I have writeen Slot in its parent ..
The following erro is coming .
Pls say o me how it will emove andwhat is reason of this eroor.
Error:

c:\Documents and Settings\ashishk\Desktop\MulteMathTool\graphicsblo ckitem.cpp(15): error C2664: 'bool QObject::connect(const QObject *,const char *,const QObject *,const char *,Qt::ConnectionType)' : cannot convert parameter 3 from 'QGraphicsItem *' to 'const QObject *'