Lanz Bullshit Forum » anyone have encountered this problem before?

Hello,

I am trying to get familiar with freeCAD developing process by practicing creating a new workbench.
I have encountered a weird problem when I am trying to simply add an ui created by QtDesigner to my workbench using Gui::TaskView class. So I created a class inherited from QWidget and declared a QOBJECT in my class. As long as I included GUi/TaskView/TaskView.h, compiler will always reports an error says:

error: variable ‘Base::BaseExport Base::Type’ has initializer but incomplete type

I wonder if anyone have encountered this problem before?
Please help.

I didn't find the right solution from the internet.

References:
https://forum.freecadweb.org/viewtopic.php?t=16220
Recruitment Management Solution Video

Thank you.