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Unable to build UE4 or AR Sample schemes on OSX 10.12.5

I am trying to build the ARKit samples. I followed the documentation on the github to build all threes schemes in order. The first two work successfully, but when I try to build hte ARKit sample or the UE4 scheme I get the following error in a few different locations:

 Nullability specifier '_Nullable' conflicts with existing specifier '_Nonnull'
Product Version: UE 4.17 Preview
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asked Jul 21 '17 at 05:20 PM in Bug Reports

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Yes Admiral, this seems to be a problem since Xcode beta 3 (and 4). I have the same problem. It seems the Xcode beta 2 does not have this problem. You will find more info and a download link at the following location: https://forums.unrealengine.com/showthread.php?149867-Unable-to-Compile-the-ARSample-in-Xcode-9-beta-3&p=736214&styleid=2

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answered Aug 02 '17 at 04:27 PM

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