This compiles/works fine with Xcode 5, but causes a compile error with Xcode 6 Beta 4:
objc_msgSend(anItem.callback_object, NSSelectorFrom
This could also be caused by running pod install using Cocoapods 0.36.beta.2. I have reported the issue to CocoaPods. "Workaround" by using CocoaPods 0.35
pod install
0.36.beta.2
0.35