启动客户端项目断言失败

[coolxu]

项目升级QT6后启动
ASSERT failure in class QFactoryLoader *__cdecl QtGlobalStatic::ApplicationHolder<struct `anonymous namespace'::Q_QAS_qtlsbLoader>::pointer(void) noexcept(false): "The application static was used without a QCoreApplication instance", file C:/Users/qt/work/qt/qtbase/src/corelib/kernel/qapplicationstatic.h, line 59
这是什么原因造成