Hello,
then i follow the book, i got this error here.
i’m on Xcode: Version 9.1 (9B55)
have any idea?
Hello Fredric,
I saw the video, and I understood that the problem was the “timer” variable was undefined.
Seeing the top of the Interface Controller you didn’t define the variable, (which should be connected to the storyboard)
Follow the steps under “Wiring The Timer” page 86, it should guide you through that 
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