Found an unexpected Mach-O header code: 1918975009 in xCode 6

What causes the error

Found an unexpected Mach-O header code: 1918975009 in xCode 6

I archived my project to send out as an ad hoc build and it builds/links/archives just fine but when I'm in the xCode organizer and select Export -> Ad Hoc,

I get the error

Found an unexpected Mach-O header code: 191897500.