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我知道這個問題已經被問了很多次，但是每個答案看起來都不一樣。我建立了我的項目，並試圖逃跑，但我得到這個錯誤：爲什麼我會遇到Apple Mach-O鏈接器（ID）錯誤？
Ld "/Users/******/Library/Developer/Xcode/DerivedData/Cypher_Bot-dxylepzskcnrtybprtuaotmycjjo/Build/Products/Debug-iphonesimulator/Cypher Bot.app/Cypher Bot" normal i386
cd "/Users/******/Xcode/iOS/Cypher Bot/Universal/Cypher Bot/Cypher Bot"
setenv MACOSX_DEPLOYMENT_TARGET 10.6
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/clang -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk -L/Users/********/Library/Developer/Xcode/DerivedData/Cypher_Bot-dxylepzskcnrtybprtuaotmycjjo/Build/Products/Debug-iphonesimulator -F/Users/**********/Library/Developer/Xcode/DerivedData/Cypher_Bot-dxylepzskcnrtybprtuaotmycjjo/Build/Products/Debug-iphonesimulator -filelist "/Users/*******/Library/Developer/Xcode/DerivedData/Cypher_Bot-dxylepzskcnrtybprtuaotmycjjo/Build/Intermediates/Cypher Bot.build/Debug-iphonesimulator/Cypher Bot.build/Objects-normal/i386/Cypher Bot.LinkFileList" -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -fobjc-arc -Xlinker -no_implicit_dylibs -D__IPHONE_OS_VERSION_MIN_REQUIRED=50000 -framework Security -framework UIKit -framework Foundation -framework CoreGraphics -framework CoreData -o "/Users/********/Library/Developer/Xcode/DerivedData/Cypher_Bot-dxylepzskcnrtybprtuaotmycjjo/Build/Products/Debug-iphonesimulator/Cypher Bot.app/Cypher Bot"
Undefined symbols for architecture i386:
"_OBJC_CLASS_$_MFMailComposeViewController", referenced from:
objc-class-ref in CryptoMainViewController.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
我也得到上述消息下面這一權利：
這是什麼意思？我該如何解決它？