UIStackView before iOS 9.0

Question

I recently upgraded XCode to the latest Version 7.0 beta 3 (7A152u).

I am using Swift for building an iPhone app and when I try to use a Stack View in Main.storyboard I

Answer 1

In my case, my deployment target was already set to 9.0. I resolved this error by updating the project format from Xcode-3.2-compatible to Xcode-6.3-compatible.

This can be found on the main Settings page of your Xcode project in the right column.