Phonegap 1.9.0 _NSURLIsExcludedFromBackupKey error

我的情况是模拟器可正常运行，但真机的时候crash。

提示：

dyld: Symbol not found: _NSURLIsExcludedFromBackupKey

  Referenced from: /var/mobile/Applications/CBD47F9C-BBF8-4968-9AC4-FA71AFB08124/PhoneGapTest.app/PhoneGapTest

  Expected in: /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation

解决办法：

在AppDelegate.m文件头部添加 

NSString * const NSURLIsExcludedFromBackupKey =@"NSURLIsExcludedFromBackupKey";