title: GameKit / GameCenter - I386
body: <p>I'm having some hard time with the iOS GameCenter
  I'm following some tutorials on <a href="http://www.youtube.com/watch?v=JjF82OYGBq4" rel="nofollow noreferrer">youtube</a>
  but as soon as I finish the code I get this error:</p>
  
  <pre><code>Ld /Users/fgringo/Library/Developer/Xcode/DerivedData/Game-Center-Test-aggpqkxrazgvnseohuityqvchrnm/Build/Products/Debug-iphonesimulator/Game-Center-Test.app/Game-Center-Test normal i386
      cd /Users/fgringo/Documents/DEVELOPER/Game-Center-Test
      setenv MACOSX_DEPLOYMENT_TARGET 10.6
      setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
      /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/llvm-gcc-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk -L/Users/fgringo/Library/Developer/Xcode/DerivedData/Game-Center-Test-aggpqkxrazgvnseohuityqvchrnm/Build/Products/Debug-iphonesimulator -F/Users/fgringo/Library/Developer/Xcode/DerivedData/Game-Center-Test-aggpqkxrazgvnseohuityqvchrnm/Build/Products/Debug-iphonesimulator -F/Users/fgringo/Documents/DEVELOPER/Game-Center-Test -filelist /Users/fgringo/Library/Developer/Xcode/DerivedData/Game-Center-Test-aggpqkxrazgvnseohuityqvchrnm/Build/Intermediates/Game-Center-Test.build/Debug-iphonesimulator/Game-Center-Test.build/Objects-normal/i386/Game-Center-Test.LinkFileList -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -framework UIKit -framework Foundation -framework CoreGraphics -framework GameKit -framework MediaPlayer -o /Users/fgringo/Library/Developer/Xcode/DerivedData/Game-Center-Test-aggpqkxrazgvnseohuityqvchrnm/Build/Products/Debug-iphonesimulator/Game-Center-Test.app/Game-Center-Test
  
  ld: warning: ignoring file /Users/fgringo/Documents/DEVELOPER/Game-Center-Test/GameKit.framework/GameKit, missing required architecture i386 in file
  ld: warning: ignoring file /Users/fgringo/Documents/DEVELOPER/Game-Center-Test/MediaPlayer.framework/MediaPlayer, missing required architecture i386 in file
  Undefined symbols for architecture i386:
    "_OBJC_CLASS_$_GKLocalPlayer", referenced from:
        objc-class-ref in GameCenterManager.o
    "_OBJC_CLASS_$_GKLeaderboard", referenced from:
        objc-class-ref in GameCenterManager.o
    "_OBJC_CLASS_$_GKScore", referenced from:
        objc-class-ref in GameCenterManager.o
    "_OBJC_CLASS_$_GKAchievement", referenced from:
        objc-class-ref in GameCenterManager.o
    "_OBJC_CLASS_$_GKPlayer", referenced from:
        objc-class-ref in GameCenterManager.o
  ld: symbol(s) not found for architecture i386
  collect2: ld returned 1 exit status
  </code></pre>