Why do I get Qt Warnings?

Qnoobish

Hello,

I am using a class and it throws me warnings referenced to Signals&slots, but I don't know the background of this, I would like to build my class the right way with no warnings.

This is my class in question:

@
class PluginPage : public QDeclarativeItem
{
Q_OBJECT

Q_PROPERTY (QString groupName READ getGroupName WRITE setGroupName)

public:
PluginPage(QDeclarativeItem* poParent = NULL);
virtual ~PluginPage(void);

void setGroupName (const QString& sName);
QString getGroupName () const;

public slots:
void recoverConnection(QString msg);
void setPluginSize(int iWidth, int iHeight);

signals:
void reconnectionMsg(QString msg);
void widthChanged();
void heightChanged();

private:
QString m_sGroupName;;
};
@

and the Warnings:

c:\tool\qt5\5.1.0\msvc2010\include\qtcore\qobject_impl.h(133): warning C4512: 'QtPrivate::QSlotObjectBase' : assignment operator could not be generated
1> c:\tool\qt5\5.1.0\msvc2010\include\qtcore\qobject_impl.h(107) : see declaration of 'QtPrivate::QSlotObjectBase'
1>c:\tool\qt5\5.1.0\msvc2010\include\qtdeclarative\qdeclarativeprivate.h(240): warning C4510: 'QDeclarativePrivate::RegisterComponent' : default constructor could not be generated
1> c:\tool\qt5\5.1.0\msvc2010\include\qtdeclarative\qdeclarativeprivate.h(234) : see declaration of 'QDeclarativePrivate::RegisterComponent'
1>c:\tool\qt5\5.1.0\msvc2010\include\qtdeclarative\qdeclarativeprivate.h(240): warning C4512: 'QDeclarativePrivate::RegisterComponent' : assignment operator could not be generated
1> c:\tool\qt5\5.1.0\msvc2010\include\qtdeclarative\qdeclarativeprivate.h(234) : see declaration of 'QDeclarativePrivate::RegisterComponent'
1>c:\tool\qt5\5.1.0\msvc2010\include\qtdeclarative\qdeclarativeprivate.h(240): warning C4610: struct 'QDeclarativePrivate::RegisterComponent' can never be instantiated - user defined constructor required
1>
1>Build succeeded.

And I am using Qt5.1 libraries and MSVC 2010 with Warnig Level4 (/W4).

It would be great if anyone could share some ideas.

Thanks in advance!