GQtClientSmarthome_Clientuserswidgetcpp14 error undefined reference to vtable for UsersWidget

This error message typically occurs when there is a missing definition for a virtual function in the class UsersWidget.

To resolve this issue, you need to ensure that all virtual functions declared in the UsersWidget class have been defined. The error is indicating that the virtual function's vtable (virtual table) is missing, which is a data structure used by the C++ compiler to handle virtual function calls.

Check the userswidget.cpp file and make sure that all virtual functions declared in the UsersWidget class have been implemented. If you have defined the virtual functions in a separate source file, ensure that you have included the necessary header file and linked it properly.

Here is an example of how the definition of a virtual function should look like in the userswidget.cpp file:

// userswidget.cpp

#include "userswidget.h"

// Definition of a virtual function declared in the UsersWidget class
void UsersWidget::virtualFunction() {
    // Implementation of the virtual function
    // ...
}

Make sure to replace virtualFunction with the actual name of the virtual function causing the error.