Error adding class to qt_ros

[feng123a]

Hello, I added the C++ class to the template of qt_ros, and I get an error:
error: base class has incomplete type
qobject.h:62:7: note: forward declaration of'QThread'

I would like to ask how to solve it. I would not appreciate it if you can answer it.

[stonier]

Can't inherit from a class that has only been forward declared. Look to your includes.

[feng123a]

无法从仅向前声明的类继承。寻找您的包括。

I added include < qthread >