之前我解压这个文件“LightCrafter4500_GUI_Source_Code_v3.0.0”, QT工程可以直接运行,现在解压后直接运行出现错误。mainwindow.cpp:4706: error: aggregate 'QEventLoop loop' has incomplete type and cannot ,5947: error: 'processEvents' is not a member of 'QApplication' 请问这是怎么回事? QT版本一直没变,电脑也没变