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我目前正在使用skyepub作为库，以便在我的应用程序中包含电子阅读器。在按照说明安装lumberjack后，我收到一个编译错误，抱怨 lumberjack 已经包含在 skyepub 中。所以我不能在我的项目中使用它！我该如何处理？

duplicate symbol _OBJC_CLASS_$_DDASLLogger in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDASLLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDASLLogger.o)
duplicate symbol _OBJC_METACLASS_$_DDASLLogger in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDASLLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDASLLogger.o)
duplicate symbol _OBJC_IVAR_$_DDLogFileManagerDefault._logsDirectory in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDFileLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDFileLogger.o)
duplicate symbol _OBJC_CLASS_$_DDLogFileFormatterDefault in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDFileLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDFileLogger.o)
duplicate symbol _OBJC_METACLASS_$_DDLogFileFormatterDefault in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDFileLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDFileLogger.o)
duplicate symbol _OBJC_CLASS_$_DDLogFileManagerDefault in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDFileLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDFileLogger.o)
duplicate symbol _OBJC_METACLASS_$_DDLogFileManagerDefault in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDFileLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDFileLogger.o)
duplicate symbol _OBJC_CLASS_$_DDFileLogger in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDFileLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDFileLogger.o)
duplicate symbol _OBJC_METACLASS_$_DDFileLogger in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDFileLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDFileLogger.o)
duplicate symbol _OBJC_IVAR_$_DDFileLogger.logFileManager in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDFileLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDFileLogger.o)
duplicate symbol _OBJC_CLASS_$_DDLogFileInfo in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDFileLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDFileLogger.o)
duplicate symbol _OBJC_METACLASS_$_DDLogFileInfo in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDFileLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDFileLogger.o)
duplicate symbol _OBJC_IVAR_$_DDLogFileInfo.filePath in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDFileLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDFileLogger.o)
duplicate symbol _OBJC_CLASS_$_DDAbstractLogger in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDLog.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDLog.o)
duplicate symbol _OBJC_METACLASS_$_DDAbstractLogger in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDLog.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDLog.o)
duplicate symbol _OBJC_CLASS_$_DDLog in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDLog.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDLog.o)
duplicate symbol _OBJC_METACLASS_$_DDLog in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDLog.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDLog.o)
duplicate symbol _OBJC_CLASS_$_DDLogMessage in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDLog.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDLog.o)
duplicate symbol _OBJC_METACLASS_$_DDLogMessage in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDLog.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDLog.o)
duplicate symbol _OBJC_CLASS_$_DDTTYLogger in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDTTYLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDTTYLogger.o)
duplicate symbol _OBJC_METACLASS_$_DDTTYLogger in: 
    /Users/me/Library/Developer/Xcode/DerivedData/aj-felgyoujugchfheepjnjfvwvmjcu/Build/Products/Debug-iphoneos/libCocoaLumberjack.a(DDTTYLogger.o)
    /Users/me/dev/ios/aj-iOS/aj/Libraries/SkyEpub/libskyepub.a(DDTTYLogger.o)
ld: 21 duplicate symbols for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

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pod文件的内容

platform :ios, "7.1"

target "some_target" do

pod 'AFNetworking', '~> 2.3'
pod 'SDWebImage', '~> 3.7'
pod 'ODRefreshControl', '~> 1.1'
pod 'Facebook-iOS-SDK', '~> 3.2'
pod 'TTTAttributedLabel', '~> 1.12'
pod 'DYRateView', '~> 0.0.2'
pod 'STTwitter', '~>0.2.2'
pod 'MBProgressHUD', '0.9'
pod 'SZTextView', '~> 1.2'
pod 'GoogleAnalytics-iOS-SDK', '~> 3.10'
pod 'Fabric'
pod 'Crashlytics'
pod 'objective-zip', :git => 'https://github.com/lobolabs/Objective-Zip'
pod 'FMDB/SQLCipher',:git => 'https://github.com/ccgus/fmdb.git'
pod 'LKDBHelper',:git => 'https://github.com/li6185377/LKDBHelper-SQLite-ORM.git'
pod 'MMDrawerController', '~> 0.5.7'
pod 'RealReachability', '~> 1.1'

end
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