Second page view in Swift,in the same project

I am trying to include a second page view in Swift, I am following this tutorial:

http://swiftiostutorials.com/ios-tutorial-using-uipageviewcontroller-create-content-slider-objective-cswift/


what I should change in this code in order to avoid error with the first page view.

Second page view in Swift,in the same project
 
 
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