title: Duplicate Symbols causing Apple Mach-O Linker Error
body: <p>I am receiving the following error when building my project.</p>
  
  <pre><code>duplicate symbol _OBJC_CLASS_$_PrintAdventureMenuViewController in:
  /Users/ethanraymond/Library/Developer/Xcode/DerivedData/jake-and-bailey-fbutnsfforlfnpgkxyojdsdcaobc/Build/Intermediates/jake-and-bailey.build/Debug-iphonesimulator/jake-and-bailey.build/Objects-normal/i386/PrintAdventureMenuViewController.o
  /Users/ethanraymond/Library/Developer/Xcode/DerivedData/jake-and-bailey-fbutnsfforlfnpgkxyojdsdcaobc/Build/Intermediates/jake-and-bailey.build/Debug-iphonesimulator/jake-and-bailey.build/Objects-normal/i386/AdventureTypeMenuViewController.o
  
  duplicate symbol _OBJC_METACLASS_$_PrintAdventureMenuViewController in:
  /Users/ethanraymond/Library/Developer/Xcode/DerivedData/jake-and-bailey-fbutnsfforlfnpgkxyojdsdcaobc/Build/Intermediates/jake-and-bailey.build/Debug-iphonesimulator/jake-and-bailey.build/Objects-normal/i386/PrintAdventureMenuViewController.o
  /Users/ethanraymond/Library/Developer/Xcode/DerivedData/jake-and-bailey-fbutnsfforlfnpgkxyojdsdcaobc/Build/Intermediates/jake-and-bailey.build/Debug-iphonesimulator/jake-and-bailey.build/Objects-normal/i386/AdventureTypeMenuViewController.o
  
  ld: 2 duplicate symbols for architecture i386
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>
  
  <p>This was just after creating "PrintAdventureMenuViewController" class. So it is currently empty. "AdventureTypeMenuViewController" is not empty. It is populated with views other code.</p>