when building, Titanium will create an Xcode project as an intermediate step and build from that. Based on you output, this step failed while not providing any reason as to why exactly it failed in the Titanium/Appcelerator log.
I would like you to open and build this Xcode project directly. Xcode should provide this missing information.
I don't remember the exact path of the Xcode project, but you should be able to locate it by simply searching for ".xcodeproj" in your project in Finder after the build having failed previously.