Dears,following is my program: #include <ktmainwindow.h> #include <qstring.h> #include <kapp.h> int main(int argc,char **argv) { KApplication myapp(argc,argv); KTMainWindow x= KTMainWindow(); x.setGeometry(100,100,200,100); x.show(); return myapp.exec(); }//end of program But i recieve following error: mohsen@darkstar:~/rozita$ ls Makefile disk2.img ktmainwindow.h main.cpp main.cpp~ main.o x* mohsen@darkstar:~/rozita$ make g++ -c -I/opt/kde/include -I/usr/local/qt/include main.cpp /usr/local/qt/include/qwidget.h: In copy constructor ` KTMainWindow::KTMainWindow(const KTMainWindow&)': /usr/local/qt/include/qwidget.h:696: error: `QWidget::QWidget(const QWidget&)' is private main.cpp:17: error: within this context make: *** [main.o] Error 1 mohsen@darkstar:~/rozita$ What's my problem? Yours,Mohsen. ___________________________________________________ . Account management: https://mail.kde.org/mailman/listinfo/kde. Archives: http://lists.kde.org/. More info: http://www.kde.org/faq.html.