[Qt-interest] Frequent error - help pls

[Spulber Iosif]

Hello!
I recently discovered Qt; I'm using Qt Creator. I do not build my projects from the command line; instead, I build directly from the IDE.

I received the following error:
undefined reference to `vtable for Question'

I understand it has something to do with   signals/slots... and that a simple call of qmake should suffice. I did "Run qmake", then build, or clean/build, but nothing seems to work. I got this another time and didn't do anything special (clicked "Run qmake", built again etc) and I got rid of the error. Now it won't go away.
  
So, what can I do?

Thanks for your support,
Iosif Spulber

PS: I don't know how to make the command line build work either... it says it doesn't recognize the command/file; I understand it should work since you install the SDK? Btw, I'm using Windows.



      
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