_BSMachError while running Stanford's CS193p Smashtag app

Question

I downloaded the Smasthag demo app from course\'s site. Project builds fine (after small changes in Twitter, TwitterRequest etc. classes, because I use the latest Xcode 7b4) and

Answer 1

This seems to be an iOS 9 Beta bug. It definitely is related to presentation and dismissal of UIKeyboard (the system one). And, at that it doesn't happen all the time.

It's harmless, just annoying. The bug will probably be resolved in the next beta since its in a core system object.