Error: 'qt_metatype_id' is not a member of 'QMetaTypeId<Nota>'

[spode]

@
#ifndef GESTORE_H
#define GESTORE_H

#include <QObject>
#include <QStringList>
#include "nota.h"

class Gestore : public QObject
{
Q_OBJECT

public:
explicit Gestore(QObject *parent = 0);

private:
void visualizzamainwindow();
QList<Nota> makeListnotes();
QStringList makeTitleslist();

signals:

public slots:
void visualizzaNotaAt(int index);

};

#endif // GESTORE_H
@

@
#include "gestore.h"
#include <QDeclarativeView>
#include <QDeclarativeContext>
#include <QGraphicsObject>
#include <QDir>
#include <QTextStream>

Gestore::Gestore(QObject *parent) :
QObject(parent)
{
this->visualizzamainwindow();
}

void Gestore::visualizzamainwindow()
{
QDeclarativeView *view = new QDeclarativeView;
view->rootContext()->setContextProperty("listaTitoli", QVariant::fromValue(this->makeTitleslist()));
view->setSource(QUrl::fromLocalFile("qml/createANote/main.qml"));
view->show();

QObject *boj = view->rootObject();
QObject::connect(boj, SIGNAL(signal_visualizzaNotaAt(int)), this, SLOT(visualizzaNotaAt(int)));

}

QStringList Gestore::makeTitleslist()
{
QList<Nota> listnotes = this->makeListnotes();
QStringList titleslist;
int i = 0;
while(i < listnotes.count())
{
titleslist.append(listnotes[i].getTitolo());
i++;
}
return titleslist;
}

QList<Nota> Gestore::makeListnotes()
{
/*
formato:
[titolo]\n
[contenuto] ENDN\n\n
*/
QDir dir("C:/CreateANote");
QList<Nota> listnotes;
if(dir.exists())
{
QFile file("C:/CreateANote/listanote.txt");
if(file.open(QIODevice::ReadOnly | QIODevice::Text))
{
QTextStream streami(&file);
while(!streami.atEnd())
{
listnotes.append(Nota(streami.readLine(), streami.readLine()));
qDebug("sono");
}
}
}
else
{
listnotes.append(Nota("Nessuna nota trovata", "Crea una nuova nota!"));
qDebug("qui");
}
return listnotes;
}

void Gestore::visualizzaNotaAt(int index)//this is what does not start with...see under
{
QDeclarativeView view;
view.rootContext()->setContextProperty("titolo", QVariant::fromValue(this->makeTitleslist().at(index)));
view.rootContext()->setContextProperty("contenuto", QVariant::fromValue(this->makeListnotes().at(index)));
view.setSource(QUrl::fromLocalFile("qml/createANote/nota.qml"));
view.show();
}
@

@
#ifndef NOTA_H
#define NOTA_H

#include <QString>

class Nota
{
public:
Nota();
Nota(QString newtitolo, QString newcontenuto);

void setTitolo(const QString newtitolo)
{
    titolo = newtitolo;
}

void setContenuto(const QString newcontenuto)
{
    contenuto = newcontenuto;
}

QString getContenuto()
{
    return contenuto;
}

QString getTitolo()
{
    return titolo;
}

private:
QString contenuto;
QString titolo;
};

#endif // NOTA_H
@

@
#include "nota.h"

Nota::Nota()
{
}

Nota::Nota(QString newtitolo, QString newcontenuto) :
titolo(newtitolo), contenuto(newcontenuto)
{

}
@

main.qml
@
import QtQuick 1.0

Rectangle {
width: 360
height: 640
gradient: Gradient {
GradientStop {
position: 0
color: "#f3e302"
}

    GradientStop {
        position: 0.500
        color: "#e2ac17"
    }

    GradientStop {
        position: 1
        color: "#d76363"
    }
}

Image {
    id: image1
    x: 26
    y: 526
    width: 309
    height: 73
    smooth: true
    source: "pulsante_arancione.png"

    Text {
        id: text1
        x: 106
        y: 0
        width: 98
        height: 48
        text: qsTr("Crea una nota")
        smooth: true
        anchors.verticalCenterOffset: -13
        anchors.horizontalCenterOffset: 0
        anchors.horizontalCenter: parent.horizontalCenter
        anchors.verticalCenter: parent.verticalCenter
        z: 1
        font.family: "Aquiline"
        font.pixelSize: 21
    }
}

signal signal_visualizzaNotaAt(int index);
ListView {
    id: list_view1
    x: 26
    y: 30
    width: 309
    height: 462
    spacing: 5
    delegate:
        Column
        {
            spacing: 5; y: 15
            Rectangle { width: 300; height: 40; color: "transparent"; Text { anchors.centerIn: parent; text: modelData } MouseArea { anchors.fill: parent; onClicked: signal_visualizzaNotaAt(index) } }
            Rectangle { width: 300; height: 1; id: lineaDiSeparazione; color: "black" }
        }
    model: listaTitoli
}

}
@

nota.qml. this is what does not start
@
import QtQuick 1.0

Rectangle {
width: 360
height: 640
gradient: Gradient {
GradientStop {
position: 0
color: "#3fc20f"
}

    GradientStop {
        position: 0.460
        color: "#0ddd1e"
    }

    GradientStop {
        position: 1
        color: "#1aff72"
    }
}

property string titolo: "default title"
property string contenuto: "default content"

Flickable {
    id: flickable1
    x: 0
    y: 0
    width: 360
    height: 640

    Text {
        id: text2
        x: 30
        y: 74
        width: 295
        height: 459
        text: titolo
        clip: true
        smooth: true
        font.pixelSize: 12
    }

    Text {
        id: text1
        x: 30
        y: 32
        width: 295
        height: 21
        text: contenuto
        smooth: true
        font.pixelSize: 12
    }
}

}
@

[koahnig]

Looks like you have to register Nota "QMetaType":http://developer.qt.nokia.com/doc/qt-4.7/qmetatype.html

Edit: This you have to "use":http://doc.qt.nokia.com/4.7/qmetatype.html#qRegisterMetaType for registration of your own types.