谁能帮我这个？
ld "/Users/orkideh/Library/Developer/Xcode/DerivedData/New_GUI-ffkeokshboqifhchxwfwfwbauahh/Build/Products/Debug-iphonesimulator/New GUI.app/New GUI" normal i386 cd "/Users/orkideh/Downloads/New GUI" setenv IPHONEOS_DEPLOYMENT_TARGET 6.1 setenv 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/iPhoneSimulator6.1。sdk -L/Users/orkideh/Library/Developer/Xcode/DerivedData/New_GUI-ffkeokshboqifhchxwfwfwbauahh/Build/Products/Debug-iphonesimulator -F/Users/orkideh/Library/Developer/Xcode/DerivedData/New_GUI-ffkeokshboqifhchxwfwfwbauahh/Build/Products/ Debug-iphonesimulator -filelist "/Users/orkideh/Library/Developer/Xcode/DerivedData/New_GUI-ffkeokshboqifhchxwfwfwbauahh/Build/Intermediates/New GUI.build/Debug-iphonesimulator/New GUI.build/Objects-normal/i386/New GUI。 LinkFileList" -Xlinker -objc_abi_version -Xlinker 2 -fobjc-arc -fobjc-link-runtime -Xlinker -no_implicit_dylibs -mios-simulator-version-min=6.1 -framework CoreMedia -framework Accounts -framework Social -framework UIKit -framework Foundation -framework CoreGraphics -framework iAd -o "/Users/orkideh/Library/Developer/Xcode/DerivedData/New_GUI-ffkeokshboqifhchxwfwfwbauahh/Build/Products/Debug-iphonesimulator/New GUI.app/New GUI"
体系结构 i386 的未定义符号：“_main”，引用自：从 crt1.o 开始 ld：未找到体系结构 i386 的符号 clang：错误：链接器命令失败，退出代码为 1（使用 -v 查看调用）
我不知道错误是什么以及我应该如何解决这个问题。感谢任何帮助