Hi, I need to send signals over a dbus connection.

This is the remote object adaptor code:

pkcontextbardbusadaptor.h
Qt Code: 
  1. #include <QtDBus>
  2. #include "pkcontextbar.h"
  3.  
  4. class pkContextBarDBusAdaptor : public QDBusAbstractAdaptor
  5. {
  6.     Q_OBJECT
  7.     Q_CLASSINFO("D-Bus Interface", "it.card-tech.pk.contextBar")
  8.  
  9. protected:
  10.     pkContextBar* m_owner;
  11.  
  12. public:
  13.     pkContextBarDBusAdaptor(pkContextBar* owner);
  14.  
  15. public slots:
  16.     int addAction(const QString& text);
  17.     void clear();
  18.  
  19. private slots:
  20.     void actionTriggered(QAction* action);
  21.  
  22. signals:
  23.     void triggered(int);
  24. };
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pkcontextbardbusadaptor.cpp
Qt Code: 
  1. #include "pkcontextbardbusadaptor.h"
  2.  
  3. pkContextBarDBusAdaptor::pkContextBarDBusAdaptor(pkContextBar* owner)
  5.           m_owner(owner)
  6. {
  7.     this->connect(m_owner, SIGNAL(triggered(QAction*)), this, SLOT(actionTriggered(QAction*)));
  8. }
  9.  
  10. /** ... CUT ... **/
  11.  
  12. void pkContextBarDBusAdaptor::actionTriggered(QAction* action)
  13. {
  14.     QList<QAction*> actions = m_owner->actions();
  15.     int action_count = actions.count();
  16.  
  17.     for (int i = 0; i < action_count; i++)
  18.     {
  19.         if (actions[i] == action)
  20.         {
  21.             emit triggered(i); // <--- Here is the problem.
  22.             break;
  23.         }
  24.     }
  25. }
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This is the pkContextBar constructor body, where I attach the dbus adaptor to the concrete object:

pkcontextbar.cpp
Qt Code: 
  1. #include "pkcontextbar.h"
  2. #include "pkcontextbardbusadaptor.h"
  3.  
  4. pkContextBar::pkContextBar(QWidget* parent)
  5.         : QMenuBar(parent),
  6.           m_ui(new Ui::pkContextBar)
  7. {
  8.     m_ui->setupUi(this);
  9.  
  10.     new pkContextBarDBusAdaptor(this);
  11. }
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The object is registered on the dbus in the main application body:

Qt Code: 
  1. pkContextBar* context_bar = new pkContextBar(m_desktop);
  2. QDBusConnection bus = QDBusConnection::sessionBus();
  3. bus.registerService("it.card-tech.pk.server");
  4. bus.registerObject("/desktop/contextBar", context_bar);
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When the pkContextBarDBusAdaptor::actionTriggered is invoked, the triggered signal emission fails and returns this error message:

process 16161: arguments to dbus_message_new_signal() were incorrect, assertion "_dbus_check_is_valid_interface (interface)" failed in file dbus-message.c line 1162.
This is normally a bug in some application using the D-Bus library.
QDBusConnection: Could not emit signal it.card-tech.pk.contextBar.triggered
Help me, please