Проблема с клиент-сервером на Qt

struct Contact{
    QString name;
    QString number;
    bool operator ==(const Contact &other) const
    {return name==other.name&& number==other.number;}
};
inline QDataStream &operator<<(QDataStream &stream, const Contact &contact)
{
    return stream << contact.name << contact.number;
}
 
inline QDataStream &operator>>(QDataStream &stream, Contact &contact)
{
    return stream >> contact.name >> contact.number;
}
 
class TableModel : public QAbstractTableModel
{
    Q_OBJECT
 
 
public:
    TableModel(QObject *parent = 0);
    TableModel(const QVector<Contact>& contacts,QObject *parent=0);
    int rowCount(const QModelIndex &parent)const;
    int columnCount(const QModelIndex& parent)const;
    QVariant data(const QModelIndex &index, int role) const;
    QVariant headerData(int section, Qt::Orientation orientation, int role) const;
    Qt::ItemFlags flags(const QModelIndex &index) const;
    bool setData(const QModelIndex &index, const QVariant &value, int role);
    bool insertRows(int position, int rows, const QModelIndex &index=QModelIndex());
    bool removeRows(int position, int rows, const QModelIndex &index=QModelIndex());
    const QVector<Contact> &getContacts()const;
private:
    QVector<Contact> contacts;
};

struct Item
{
uint id;
QString name;
QString caption;
}: