Unknown Object Path even after registering object in QDbus

[spyd3r]

I created an Interface header file and called qt5_generate_dbus_interface() from cmake to get a .xml file.
Then I generated an adaptor from this .xml file by calling qt_add_dbus_adaptor().
In the Interface cpp file's ctor, I binded the adaptor generated and called registerObject() and registerService() with valid arguments.
The booleans for both returned true.
However, I get the following error:

Call to object / <My Service>: org.freedesktop.DBus.Error.UnknownObject (No such object path '/') failed

Calling on the path, that I registered object at, also causes the same error.

Some Cmake code

set(dbus_SRCS org.kde.kdenow.Flight.xml)
 +
 +qt5_generate_dbus_interface(flightinterface.h
 +                            org.kde.kdenow.Flight.xml
 +                            OPTIONS -M
 +                            )
 +
 +qt5_add_dbus_adaptor(dbus_SRCS
 +                     ${CMAKE_CURRENT_BINARY_DIR}/org.kde.kdenow.Flight.xml
 +                     flightinterface.h
 +                     FlightInterface
 +                    )

flightinterface.h

class FlightInterface : public QObject
{
        Q_OBJECT
        Q_CLASSINFO("D-Bus Interface", "org.kde.kdenow.Flight");

    public:
        explicit FlightInterface(QObject* parent = 0);
        void setMap(QVariantMap& map);

    public Q_SLOTS:
        QVariantMap getMap();

    private:
        QVariantMap m_map;
};

flightinterface.cpp

FlightInterface::FlightInterface(QObject* parent): QObject(parent)
{
    new FlightAdaptor(this);
    QDBusConnection dbus = QDBusConnection::sessionBus();
    bool obOk = dbus.registerObject("/Flight", this);
    bool serOk= dbus.registerService("org.kde.kdenow.Flight");
    if (!obOk) {
        qDebug() << "Could not register Object";
    }
    else {
        qDebug() << "Registered object at path";
    }
    if (!serOk) {
        qDebug() << "Could not register service";
    }
    else {
        qDebug() << "Registered Service";
    }
}

void FlightInterface::setMap(QVariantMap& map)
{
    m_map = map;
    qDebug() << m_map;
}

QVariantMap FlightInterface::getMap()
{
    return m_map;
}

I setMap() from some other valid code.