Qt5 Plugin: undefined symbol problem

Hi,

Today I faced really strange problem. Every solution I found doesn't work...
My interfaces and plugins used to work with Qt4 but after migrating to Qt5 they don't work anymore.

after loading this error appears:

Code:

"libdialog.so" true "Cannot load library [...]/libdialog.so: ([...]/libdialog.so: undefined symbol: _ZTIN6editor10editorcore6ModuleE)"

I'm also using Cmake to build all stuff

here is My interface class

Code:

namespace editor {
namespace editorcore {
 
class Module {
public:
	Module();
	virtual ~Module();
 
	void load(const QString& newFileName);
	void save(const QString& newFileName);
 
	virtual QString getModuleName() const =0;
	const QString& getFileName() const;
	QWidget* getQtWidget() const;
 
	void setMainWindow(QMainWindow *mainWindow);
 
protected:
	virtual void onLoad() =0;
	virtual void onSave() =0;
	virtual void onSetMainWindow() =0;
 
	void setQtWidget(QWidget* newQWidget);
 
	QMainWindow *_mainWindow;
private:
	ScopedPtr<QString> _fileName;
	QWidget* _qtWidget;
};
// class Module
 
}// namespace editorcore
} // namespace editor
 
Q_DECLARE_INTERFACE(editor::editorcore::Module, INTERFACE_NAME)
 
//////////////////////////////////////////////////////////
//     implementation class:
 
namespace editor {
namespace dialogeditor {
 
class DialogEditorModule: public QObject, public editor::editorcore::Module {
Q_OBJECT
 
Q_INTERFACES(editor::editorcore::Module)
Q_PLUGIN_METADATA(IID "editor.DialogEditorModule" FILE "DialogEditorModule.json")
 
public:
	DialogEditorModule();
	virtual ~DialogEditorModule();
	virtual QString getModuleName() const;
 
protected:
	virtual void onLoad();
	virtual void onSave();
	virtual void onSetMainWindow();
};
 
} // namespace dialogeditor
} // namespace editor
 
////////////////////////////////////
//json file:
{
    "Keys": [ "DialogEditorModule" ]
}

Code:

#####################
#main project file
 
CMAKE_MINIMUM_REQUIRED(VERSION 2.8.9)
 
GET_FILENAME_COMPONENT(name "${CMAKE_CURRENT_SOURCE_DIR}" NAME)
 
PROJECT(${name} CXX)
 
set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
	find_package(Qt5Core REQUIRED)
	find_package(Qt5Gui REQUIRED)
	find_package(Qt5Quick REQUIRED)
	find_package(Qt5Widgets REQUIRED)
 
	include_directories(${Qt5Core_INCLUDE_DIRS})
	include_directories(${Qt5Gui_INCLUDE_DIRS})
	include_directories(${Qt5Quick_INCLUDE_DIRS})
	include_directories(${Qt5Widgets_INCLUDE_DIRS})
 
 
add_subdirectory(app)
add_subdirectory(dialog)
 
 
#####################
# app project file
 
set (COMPILE_ARGS
    ${${PROJECT_NAME}_SRC_FILES}
    ${${PROJECT_NAME}_INC_FILES}
    ${${PROJECT_NAME}_MOC_FILES}
    ${${PROJECT_NAME}_FORMS}
)
 
    add_executable(${PROJECT_NAME}  ${COMPILE_ARGS})
 
INIT_LIBS()
	qt5_use_modules(${PROJECT_NAME} Core)
	qt5_use_modules(${PROJECT_NAME} Gui)
	qt5_use_modules(${PROJECT_NAME} Widgets)
 
 
#####################
# plugin project file
 
	ADD_LIBRARY(${PROJECT_NAME} MODULE
		${${PROJECT_NAME}_SRC_FILES}
		${${PROJECT_NAME}_INC_FILES}
		${${PROJECT_NAME}_MOC_FILES}
	)	
 
	qt5_use_modules(${PROJECT_NAME} Core)
	qt5_use_modules(${PROJECT_NAME} Gui)
	qt5_use_modules(${PROJECT_NAME} Widgets)

any idea? I'm totally puzzled...