strange error in compilation

[danadam]

but it is still giving same output.

Really? Is "qmenubar.h:29: error: expected initializer before 'QtGuiModule'" still there? Well, in that case I have no more ideas what the solution could be.

As far as the second error is concerned:

va.cpp: In member function 'virtual void vA1::initGui()':
va.cpp:98: error: no matching function for call to 'QAction::QAction(QIcon, const char [4], vA1* const)'
/usr/local/Trolltech/Qt-4.1.2//include/QtGui/qaction.h:173: note: candidates are: QAction::QAction(const QAction&)
...

va.cpp: In member function 'virtual void vA1::initGui()':
va.cpp:98: error: no matching function for call to 'QAction::QAction(QIcon, const char [4], vA1* const)'
/usr/local/Trolltech/Qt-4.1.2//include/QtGui/qaction.h:173: note: candidates are: QAction::QAction(const QAction&)
...

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It seems that in line 98 of va.cpp you are calling QAction constructor, but with wrong parameters. There is no QAction(QIcon, const char [4], vA1* const) constructor (at least according to compiler ) and it gives you a list of similar ones, which exist.