Mac Packaging Fails

I’m making my first attempt at packaging my project but it’s going rough. I’ve been using blueprints only, and I am not using the git version of the editor. I’ve worked through a lot of warnings, but now i’m stuck without much useful information from the logs.

The only warnings I have left are about a metal texture that I don’t even use

LogMetal:Warning: Metal Shader Model 5 support requires Mac OS X El Capitan 10.11.5 or later & an AMD or Nvidia GPU. Falling back to Metal Shader Model 4.
LogDialogs:Warning: Suppressed: Please update to the latest version of Mac OS X for best performance.
LogUObjectGlobals:Warning: Failed to find object ‘Class None.’
LogMetal:Warning: Reallocating ring-buffer from 65536 to 131072 to avoid wrapping write at offset 18176 into outstanding buffer region 18112 at frame 0]
LogMetal:Warning: Reallocating ring-buffer from 131072 to 262144 to avoid wrapping write at offset 78080 into outstanding buffer region 79136 at frame 1]
LogMetal:Warning: Reallocating ring-buffer from 262144 to 524288 to avoid wrapping write at offset 82944 into outstanding buffer region 84928 at frame 2]
LogMetal:Warning: Reallocating ring-buffer from 524288 to 1048576 to avoid wrapping write at offset 53504 into outstanding buffer region 55744 at frame 357]
PackagingResults:Error: Error Unknown Error

The full log is below - is there any way to determine what the Error is from? I haven’t packaged anything before so I don’t know if I’m missing a step?

full log: http://pastebin.com/FWLSCjkP

Resolved - being new to this I didn’t realize the need for xcode. Once installed, it packaged.