我使用google + api从google + link
登录但是当我添加OpenSource目录时，从上面的链接我得到了以下错误。
Ld /Users/Administrator/Library/Developer/Xcode/DerivedData/googleIntegration-fkbmbszsnxryxgfuzpeulxiqytcn/Build/Products/Debug-iphonesimulator/googleIntegration.app/googleIntegration normal i386
cd /Users/Administrator/Desktop/googleIntegration
export IPHONEOS_DEPLOYMENT_TARGET=6.0
export PATH="/Applications/Xcode 2.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode 2.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Applications/Xcode\ 2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386 -isysroot /Applications/Xcode\ 2.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk -L/Users/Administrator/Library/Developer/Xcode/DerivedData/googleIntegration-fkbmbszsnxryxgfuzpeulxiqytcn/Build/Products/Debug-iphonesimulator -F/Users/Administrator/Library/Developer/Xcode/DerivedData/googleIntegration-fkbmbszsnxryxgfuzpeulxiqytcn/Build/Products/Debug-iphonesimulator -F/Users/Administrator/Downloads/google-plus-ios-sdk-1.5.1 -filelist /Users/Administrator/Library/Developer/Xcode/DerivedData/googleIntegration-fkbmbszsnxryxgfuzpeulxiqytcn/Build/Intermediates/googleIntegration.build/Debug-iphonesimulator/googleIntegration.build/Objects-normal/i386/googleIntegration.LinkFileList -Xlinker -objc_abi_version -Xlinker 2 -ObjC -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=6.0 -framework SystemConfiguration -framework Security -framework MediaPlayer -framework CoreText -framework CoreGraphics -framework GooglePlus -framework CoreMotion -framework CoreLocation -framework AssetsLibrary -framework AddressBook -framework UIKit -framework GoogleOpenSource -framework Foundation -Xlinker -dependency_info -Xlinker /Users/Administrator/Library/Developer/Xcode/DerivedData/googleIntegration-fkbmbszsnxryxgfuzpeulxiqytcn/Build/Intermediates/googleIntegration.build/Debug-iphonesimulator/googleIntegration.build/Objects-normal/i386/googleIntegration_dependency_info.dat -o /Users/Administrator/Library/Developer/Xcode/DerivedData/googleIntegration-fkbmbszsnxryxgfuzpeulxiqytcn/Build/Products/Debug-iphonesimulator/googleIntegration.app/googleIntegration
duplicate symbol _OBJC_IVAR_$_GTMHTTPFetcher.request_ in:
/Users/Administrator/Library/Developer/Xcode/DerivedData/googleIntegration-fkbmbszsnxryxgfuzpeulxiqytcn/Build/Intermediates/googleIntegration.build/Debug-iphonesimulator/googleIntegration.build/Objects-normal/i386/GTMHTTPFetcher.o
我检查了其他链接并尝试了他们的建议，但我没有成功？
有谁能告诉我究竟是什么问题？
任何帮助都会很明显。