QWidget::metric:Invalid metric command

Hi all,
I meet an "QWidget::metric:Invalid metric command" error when I run my program.
why? Thanks!

can you show us your code?

Hi all,
I have solved this problem. The reson maybe is that I declare some virtual functions in base class and sub-class, but I do not declare virtual destructor, maybe some memory do not release. So I declare virtual destructor in both base class and sub-class.