QT CREATOR 创建出现下面的问题怎么办！

520

ui_mainwindow.h: In member function 'void Ui_MainWindow::setupUi(QMainWindow*)':
ui_mainwindow.h:47: error: invalid use of incomplete type 'struct QStatusBar'
../extended4.4.3/builddir/sdk/qtopiacore/target/include/QtGui/qmainwindow.h:54: error: forward declaration of 'struct QStatusBar'
ui_mainwindow.h:48: error: invalid use of incomplete type 'struct QStatusBar'
../extended4.4.3/builddir/sdk/qtopiacore/target/include/QtGui/qmainwindow.h:54: error: forward declaration of 'struct QStatusBar'
ui_mainwindow.h:49: error: 'class QMainWindow' has no member named 'setStatusBar'