title: I am getting this error. What is wrong?
body: <p>I get the below error. Why do I get it?</p>
  
  <blockquote>
    <p>Duplicate symbol _main in:
        /Users/AlexBomnd/Library/Developer/Xcode/DerivedData/Backpack-gcnxteerautalugwepzkevaqgtxe/Build/Intermediates/Backpack.build/Debug-iphonesimulator/Backpack.build/Objects-normal/x86_64/main.o
        /Users/AlexBomnd/Library/Developer/Xcode/DerivedData/Backpack-gcnxteerautalugwepzkevaqgtxe/Build/Intermediates/Backpack.build/Debug-iphonesimulator/Backpack.build/Objects-normal/x86_64/AppDelegate-2D6246B5E95B9D9F.o
    ld: 1 duplicate symbol for architecture x86_64 clang: error: linker
    command failed with exit code 1 (use -v to see invocation)</p>
  </blockquote>