Connecting signal to button

[jpn]

I've got this strange warning on one of my ui forms :

'Warning : The project doesn't contain any class which uses this form!'

Very strange as it does, anybody had this error before?

All I am trying to do is connect a signal to a QPushButton!

I get the error when I double click on my QPushButton on the form.

Hmm, you don't connect signals by double clicking. When you double click a child widget of a form the integration attempts to insert a slot stub with naming convention of automatic connections. Now, if there is no relevant class, or the integration is unable to detect where the form is being used, such error makes sense.