Error when closing application in Qt4.8 using QDeclarative and QML

[Qnoobish]

Hello,

I am having some trouble when I close my application I get an error. I am defining a new QML element by QDeclarativeItem and sharing a property through Q_PROPERTY. My class looks like this:

@class PluginName : public QDeclarativeItem
{
Q_OBJECT
Q_PROPERTY (QString pluginName READ m_sGetPluginName WRITE m_vSetPluginName)

public:
//PluginPage(QDeclarativeItem* poParent = NULL);
//~PluginPage();
void m_vSetPluginName (const QString& sName);
QString m_sGetPluginName () const;

private:
QString m_sPluginName;
};@

And in the .cpp:

@void PluginName::m_vSetPluginName (const QString& sName)
{
m_sPluginName = sName;
}

QString PluginName::m_sGetPluginName () const
{
return m_sPluginName;
}@

Also My .qml

@import QtQuick 1.1
import Simu 1.0

Item{
id: mainWindow
objectName: "item"
width:1000
height:600

PluginName
{
pluginName:"name"
}

Rectangle
{
    id: idMyWindow                   // unique identifier for this button

objectName: "rect"
color: "blue" // backgrond color
width: 800 // window size
height: 600
x: 10 // x-absolute position from parent <mainWindow>
y: 20 // y-absolute position from parent <mainWindow>

}

}@

I am also using "qmlRegisterType" to register my PluginName class.

If I don't use my new QML element then I don't get the heap error I wonder what is wrong :(

This is the error, I am using MSVC 2005:

"Windows has triggered a breakpoint in _visufrwk_proj.exe.

This may be due to a corruption of the heap, and indicates a bug in _visufrwk_proj.exe or any of the DLLs it has loaded.

The output window may have more diagnostic information"

Hopefully someone could share some knowledge.
Thanks in advance.