Line 38. Just replace the image file name from:
let item1 = ExpandingMenuItem(size: menuButtonSize, title: "Music", image: UIImage(named: "chooser-moment-icon-music")!, highlightedImage: UIImage(named: "chooser-moment-icon-place-highlighted")!, backgroundImage: UIImage(named: "chooser-moment-button"), backgroundHighlightedImage: UIImage(named: "chooser-moment-button-highlighted")) { () -> Void in
to
let item1 = ExpandingMenuItem(size: menuButtonSize, title: "Music", image: UIImage(named: "chooser-moment-icon-music")!, highlightedImage: UIImage(named: "chooser-moment-icon-music-highlighted")!, backgroundImage: UIImage(named: "chooser-moment-button"), backgroundHighlightedImage: UIImage(named: "chooser-moment-button-highlighted")) { () -> Void in