Cghost This is the third thread you've started asking the same question. I responded to the first one, hid the second one, then find this one is here too, so now I've deleted the first one because someone has answered here.
Please, just start one thread.
Pasting what I wrote in the other thread:
Have you tried selecting the correct format out of the options at the top of the screen? And are you sure the QR code is clear enough?
As far as I can tell, the QR code scanning code is all part of the camera app, so I'm having a hard time thinking of a possible reason why you're having trouble scanning a QR code.