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從谷歌「手機後端啓動器」編譯「iOS客戶端」時，以下任何人都有錯誤？ 的Xcode 5.02，iPhone的iOS 7手機後端啓動器 - iOS客戶端（App Engine）
duplicate symbol _kCloudBackendClientID in:
/Users/paolo/Library/Developer/Xcode/DerivedData/CloudBackendIOSClient-gjhkqbarudkpudeeytxgowaihtym/Build/Intermediates/CloudBackendIOSClient.build/Debug-iphoneos/CloudBackendIOSClient.build/Objects-normal/armv7/MessagesTableViewController.o
/Users/paolo/Library/Developer/Xcode/DerivedData/CloudBackendIOSClient-gjhkqbarudkpudeeytxgowaihtym/Build/Intermediates/CloudBackendIOSClient.build/Debug-iphoneos/CloudBackendIOSClient.build/Objects-normal/armv7/Constants.o
duplicate symbol _kCloudBackendClientSecret in:
/Users/paolo/Library/Developer/Xcode/DerivedData/CloudBackendIOSClient-gjhkqbarudkpudeeytxgowaihtym/Build/Intermediates/CloudBackendIOSClient.build/Debug-iphoneos/CloudBackendIOSClient.build/Objects-normal/armv7/MessagesTableViewController.o
/Users/paolo/Library/Developer/Xcode/DerivedData/CloudBackendIOSClient-gjhkqbarudkpudeeytxgowaihtym/Build/Intermediates/CloudBackendIOSClient.build/Debug-iphoneos/CloudBackendIOSClient.build/Objects-normal/armv7/Constants.o
duplicate symbol _kCloudBackendChainName in:
/Users/paolo/Library/Developer/Xcode/DerivedData/CloudBackendIOSClient-gjhkqbarudkpudeeytxgowaihtym/Build/Intermediates/CloudBackendIOSClient.build/Debug-iphoneos/CloudBackendIOSClient.build/Objects-normal/armv7/MessagesTableViewController.o
/Users/paolo/Library/Developer/Xcode/DerivedData/CloudBackendIOSClient-gjhkqbarudkpudeeytxgowaihtym/Build/Intermediates/CloudBackendIOSClient.build/Debug-iphoneos/CloudBackendIOSClient.build/Objects-normal/armv7/Constants.o
duplicate symbol _kCloudBackendServiceURL in:
/Users/paolo/Library/Developer/Xcode/DerivedData/CloudBackendIOSClient-gjhkqbarudkpudeeytxgowaihtym/Build/Intermediates/CloudBackendIOSClient.build/Debug-iphoneos/CloudBackendIOSClient.build/Objects-normal/armv7/MessagesTableViewController.o
/Users/paolo/Library/Developer/Xcode/DerivedData/CloudBackendIOSClient-gjhkqbarudkpudeeytxgowaihtym/Build/Intermediates/CloudBackendIOSClient.build/Debug-iphoneos/CloudBackendIOSClient.build/Objects-normal/armv7/Constants.o
ld: 7 duplicate symbols for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)