Application crashes at launch-time

[Salazaar]

We don't even know what functionality you are talking about.

Objects on which I was doing:

ui.element->hide();

ui.element->hide();

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doesn't work, nextStepButton does nothing and so on. Maybe It'll b e better if you can see my code. I'll attach dialog.cpp

Do you know how to use signals and slots?

Your kidding me? Of course, I know.
edit:
The problem isn't that I don't know how to connect signals to slots, I have functions which do something, connected to something and all should work, but it doesn't. Look at my file