I ran into a really interesting, some might say frustrating, quirk of the Apportable Engine.
In order to get XCode to compile on the Android OS, it turns out that you have to explicitly add any file or resource that your project is going to use to your project.
In order to do this, first navigate to the Build Phase Tab in you Project Navigator.
Then, in the Compile Sources Section you’ll have to manually add references to your Class files.
Then, in the Copy Bundle Resources Section you’ll have to manually add references to you resource file.
And that should clear up the error.