Apple Match-O 链接器错误 Xcode 5.1.1

Question

美好的一天！我最近在做一个需要连接到 Google Drive 的应用程序，现在我按照这些说明进行操作，https://developers.google.com/drive/ios/quickstart。现在我在构建项目时出错。这是错误信息，

Ld /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/ECOSIGNATURE.app/ECOSIGNATURE normal i386
    cd /Users/ogcpaslevis/Desktop/ECOSIGNATURE
    export IPHONEOS_DEPLOYMENT_TARGET=7.1
    export 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/iPhoneSimulator7.1.sdk -L/Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator -F/Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator -filelist /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/ECOSIGNATURE.LinkFileList -Xlinker -objc_abi_version -Xlinker 2 -ObjC -all_load -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=7.1 -framework MobileCoreServices -framework SystemConfiguration -framework Security /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a -framework CoreGraphics -framework UIKit -framework Foundation -Xlinker -dependency_info -Xlinker /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/ECOSIGNATURE_dependency_info.dat -o /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/ECOSIGNATURE.app/ECOSIGNATURE

duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.completionBlock_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.delegate_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.finishedSelector_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.signIn_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.savedCookiePolicy_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.webView_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.backButton_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.forwardButton_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.initialActivityIndicator_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.navButtonsView_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.rightBarButtonItem_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.request_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.systemCookies_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.signInCookies_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.popViewBlock_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.keychainItemName_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.initialHTMLString_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.browserCookiesURL_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.userData_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.properties_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.didDismissSelf_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.hasNotifiedWebViewStartedLoading_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.hasCalledFinished_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.hasDoneFinalRedirect_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.mustShowActivityIndicator_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _kGTMOAuth2CookiesWillSwapOut in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.isViewShown_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.didViewAppear_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _kGTMOAuth2CookiesDidSwapIn in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_IVAR_$_GTMOAuth2ViewControllerTouch.keychainItemAccessibility_ in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _kGTMOAuth2KeychainErrorDomain in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_CLASS_$_GTMOAuth2ViewControllerTouch in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_METACLASS_$_GTMOAuth2ViewControllerTouch in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_CLASS_$_GTMOAuth2Keychain in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
duplicate symbol _OBJC_METACLASS_$_GTMOAuth2Keychain in:
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Intermediates/ECOSIGNATURE.build/Debug-iphonesimulator/ECOSIGNATURE.build/Objects-normal/i386/GTMOAuth2ViewControllerTouch.o
    /Users/ogcpaslevis/Library/Developer/Xcode/DerivedData/ECOSIGNATURE-axdjydxlfmeraobatbkzaysdroun/Build/Products/Debug-iphonesimulator/libGTLTouchStaticLib.a(GTMOAuth2ViewControllerTouch.o)
ld: 35 duplicate symbols for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我该如何解决这个错误？谢谢！

Answer 1

步骤：

检查目标设置中的构建阶段。 检查任何文件是否存在两次或一次。 如果文件存在两次删除一个。如果不删除底部的文件，这是最新的文件。 重新构建。

发件人：duplicate symbols for architecture i386 clang

Answer 2

错误背后的原因可能是你实现了两次GTMOAuth2ViewControllerTouch。

可能是您错误地将GTMOAuth2ViewControllerTouch.m 文件导入YourClass.m 或YourClass.h 文件而不是GTMOAuth2ViewControllerTouch.h