I use Qt Creator to design my GUI. Everything seems to be working as I expect, but when the program executes it generates some error messages (which do not cause it to terminate). Here is an example of one category of error message:

In Qt Creator I have created a radio button, with objectName rbut_ACTIVATION_MODE_0. I have set up the signal toggled(bool) to the receiver MainWindow, to slot on_activation_mode_toggled(bool). In mainwindow.cpp I have code for
void MainWindow:n_activation_mode_toggled(bool) which is declared as a private slot.
After the program has executed I see this message:

QMetaObject::connectSlotsByName: No matching signal for on_activation_mode_toggled(bool)

Perhaps somebody can explain what this means.