qgraphicsitem_cast problem

[dreamer]

After compiling the code, i have this 3 error:

moc_pixmapitem.cpp:40: error: ‘staticMetaObject’ is not a member of ‘QGraphicsPixmapItem’

moc_pixmapitem.cpp:54: error: ‘qt_metacast’ is not a member of ‘QGraphicsPixmapItem’

moc_pixmapitem.cpp:59: error: ‘qt_metacall’ is not a member of ‘QGraphicsPixmapItem’

I have this error, when i inserted this line of code in my MainWIndow application:

QGraphicsItem* item;
if(item->type() == pixmapItem::Type)
			qgraphicsitem_cast<pixmapItem *>(item);

QGraphicsItem* item;
if(item->type() == pixmapItem::Type)
			qgraphicsitem_cast<pixmapItem *>(item);

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I add to pixmapitem.h file:

public:
enum { Type = UserType + 2 };
int type() const{return Type;}

public:
enum { Type = UserType + 2 };
int type() const{return Type;}

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What's wrong???