title: 1 duplicate symbol for architecture i386
body: <p>I am facing a critical problem here, Xcode throws strange exception while building it's 
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  <blockquote>
    <p>duplicate symbol _selected in:
        /Users/mhgaber/Library/Developer/Xcode/DerivedData/اProject-Name-aopcbghvorqhdwbyudzqsyhtekcu/Build/Intermediates/Project-Name.build/Debug-iphonesimulator/Project-Name.build/Objects-normal/i386/ClassX.o
        /Users/mhgaber/Library/Developer/Xcode/DerivedData/Project-Name-aopcbghvorqhdwbyudzqsyhtekcu/Build/Intermediates/Project-Name.build/Debug-iphonesimulator/Project-Name.build/Objects-normal/i386/ClassY.o
    ld: 1 duplicate symbol for architecture i386
    clang: error: linker command failed with exit code 1 (use -v to see invocation)</p>
  </blockquote>
  
  <p>I searched a lot but I didn't find anything help me please</p>