What does the error mean?

Question

Ld /Users/michaelsonsamuels/Library/Developer/Xcode/DerivedData/Video-hedtrampxpseetfcmcksycqvmpuk/Build/Products/Debug-iphonesimulator/Video.app/Video normal i386
    cd "/Users/michaelsonsamuels/Desktop/Xcode /Video"
    setenv IPHONEOS_DEPLOYMENT_TARGET 6.1
    setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.1.sdk -L/Users/michaelsonsamuels/Library/Developer/Xcode/DerivedData/Video-hedtrampxpseetfcmcksycqvmpuk/Build/Products/Debug-iphonesimulator -F/Users/michaelsonsamuels/Library/Developer/Xcode/DerivedData/Video-hedtrampxpseetfcmcksycqvmpuk/Build/Products/Debug-iphonesimulator -filelist /Users/michaelsonsamuels/Library/Developer/Xcode/DerivedData/Video-hedtrampxpseetfcmcksycqvmpuk/Build/Intermediates/Video.build/Debug-iphonesimulator/Video.build/Objects-normal/i386/Video.LinkFileList -Xlinker -objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=6.1 -framework StoreKit -framework AudioToolbox -framework MessageUI -framework SystemConfiguration -framework CoreGraphics -framework UIKit -framework Foundation -o /Users/michaelsonsamuels/Library/Developer/Xcode/DerivedData/Video-hedtrampxpseetfcmcksycqvmpuk/Build/Products/Debug-iphonesimulator/Video.app/Video

Undefined symbols for architecture i386:
  "_OBJC_CLASS_$_GADBannerView", referenced from:
      objc-class-ref in ViewController.o
  "_OBJC_CLASS_$_GADRequest", referenced from:
      objc-class-ref in ViewController.o
  "_kGADAdSizeBanner", referenced from:
      -[ViewController viewDidLoad] in ViewController.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Ld /Users/michaelsonsamuels/Library/Developer/Xcode/DerivedData/Video-hedtrampxpseetfcmcksycqvmpuk/Build/Products/Debug-iphonesimulator/Video.app/Video normal i386
    cd "/Users/michaelsonsamuels/Desktop/Xcode /Video"
    setenv IPHONEOS_DEPLOYMENT_TARGET 6.1
    setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.1.sdk -L/Users/michaelsonsamuels/Library/Developer/Xcode/DerivedData/Video-hedtrampxpseetfcmcksycqvmpuk/Build/Products/Debug-iphonesimulator -F/Users/michaelsonsamuels/Library/Developer/Xcode/DerivedData/Video-hedtrampxpseetfcmcksycqvmpuk/Build/Products/Debug-iphonesimulator -filelist /Users/michaelsonsamuels/Library/Developer/Xcode/DerivedData/Video-hedtrampxpseetfcmcksycqvmpuk/Build/Intermediates/Video.build/Debug-iphonesimulator/Video.build/Objects-normal/i386/Video.LinkFileList -Xlinker -objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=6.1 -framework StoreKit -framework AudioToolbox -framework MessageUI -framework SystemConfiguration -framework CoreGraphics -framework UIKit -framework Foundation -o /Users/michaelsonsamuels/Library/Developer/Xcode/DerivedData/Video-hedtrampxpseetfcmcksycqvmpuk/Build/Products/Debug-iphonesimulator/Video.app/Video

Undefined symbols for architecture i386:
  "_OBJC_CLASS_$_GADBannerView", referenced from:
      objc-class-ref in ViewController.o
  "_OBJC_CLASS_$_GADRequest", referenced from:
      objc-class-ref in ViewController.o
  "_kGADAdSizeBanner", referenced from:
      -[ViewController viewDidLoad] in ViewController.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

  "_OBJC_CLASS_$_GADBannerView", referenced from:


      objc-class-ref in ViewController.o


  "_OBJC_CLASS_$_GADRequest", referenced from:


      objc-class-ref in ViewController.o


  "_kGADAdSizeBanner", referenced from:


      -[ViewController viewDidLoad] in ViewController.o


ld: symbol(s) not found for architecture i386


clang: error: linker command failed with exit code 1 (use -v to see invocation)

Thanks.

Answer 1

Your classes are missing from Build target. I don't know about your project structure and files but it looks like GADBannerView and GADRequest classes are missing.

Remove these files from your project. add them again and remember to check "ADD TO TARGET" checkbox.

Answer 2

将libGoogleAdMobAds.a添加到Linked Frameworks and Libraries 。

Answer 3

this error shows that u haven't added GADBannerView, and GADRequest classes.

please check by following this steps:

in XCode select your Project in the Target Section then switch to BuildPhases->CompileSources

here check for GADBannerView.m and GADRequest.m files.

XCode->Your Project in Target section->BuildPhases->CompileSources

hope this will help you.