I tried to download and compile https://developer.apple.com/library/content/samplecode/SourceView/Introduction/Intro.html
I have: Xcode Version 8.0 (8A218a) macOS Sierra 10.12 Beta (16A313a)
I get the following error:
/Users/test/Downloads/SourceViewUsingNSOutlineViewwithNSTreeController/SourceView/Base.lproj/Main.storyboard: Exception while running ibtool: [<__NSCFConstantString 0x10db4cca0> valueForUndefinedKey:]: this class is not key value coding-compliant for the key nodeTitle.
Does anyone has a clue on how to fix this?