Ipad Apple Match-O链接器（Id）错误

我不知道这个错误在说什么。retrievePatients方法与WSDL文件交互。错误到底是什么？我应该搜索什么来修复它？ 谢谢

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在Download.h或.m中，链接并导入

Ld /Users/chibb9/Library/Developer/Xcode/DerivedData/AllRelatedMethodsDemo-cixcxshgvqywvcgbqxcivzvomzuf/Build/Products/Debug-iphonesimulator/AllRelatedMethodsDemo.app/AllRelatedMethodsDemo normal i386
    cd "/Users/chibb9/MEDiSN Research/AllRelatedMethodsDemo"
    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/chibb9/Library/Developer/Xcode/DerivedData/AllRelatedMethodsDemo-cixcxshgvqywvcgbqxcivzvomzuf/Build/Products/Debug-iphonesimulator
-F/Users/chibb9/Library/Developer/Xcode/DerivedData/AllRelatedMethodsDemo-cixcxshgvqywvcgbqxcivzvomzuf/Build/Products/Debug-iphonesimulator
-filelist /Users/chibb9/Library/Developer/Xcode/DerivedData/AllRelatedMethodsDemo-cixcxshgvqywvcgbqxcivzvomzuf/Build/Intermediates/AllRelatedMethodsDemo.build/Debug-iphonesimulator/AllRelatedMethodsDemo.build/Objects-normal/i386/AllRelatedMethodsDemo.LinkFileList
-mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -lxml2 -Xlinker -no_implicit_dylibs -D__IPHONE_OS_VERSION_MIN_REQUIRED=50000 -framework SystemConfiguration -framework UIKit -framework Foundation -framework CoreGraphics -o /Users/chibb9/Library/Developer/Xcode/DerivedData/AllRelatedMethodsDemo-cixcxshgvqywvcgbqxcivzvomzuf/Build/Products/Debug-iphonesimulator/AllRelatedMethodsDemo.app/AllRelatedMethodsDemo

Undefined symbols for architecture i386:   "_retrievePatients", referenced from:
      -[MEDiSN20AidnWebServiceRunner run] in MEDiSN20AidnWebServiceRunner.o   "_OBJC_METACLASS_$_NSManagedObject", referenced from:
      _OBJC_METACLASS_$_Download in Download.o   "_OBJC_CLASS_$_NSManagedObject", referenced from:
      _OBJC_CLASS_$_Download in Download.o ld: symbol(s) not found for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation)