"API error: (null) returned 0 width, assuming UIViewNoIntrinsicMetric" in Xcode 9 beta

I'm working on several projects and it happens the same error.

I still can't figure out what's causing it. Is it the problem with my code or Xcode 9 beta?

MyApp[22724:4000717] API error: (null) returned 0 width, assuming UIViewNoIntrinsicMetric