iOS 4.3でコアデータが機能しない

私のコアデータに問題があります。 iOS 5.0以降で動作していますが、iOS 4.3で動作させた場合、クラッシュして、回線にクラッシュします__managedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];誰かが私を助けることができますか？iOS 4.3でコアデータが機能しない

2012-05-08 17:01:21.617 [7489:10e03] -[NSManagedObjectContext initWithConcurrencyType:]: unrecognized selector sent to instance 0x4ddc6c0 
2012-05-08 17:01:21.650 [7489:10e03] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSManagedObjectContext initWithConcurrencyType:]: unrecognized selector sent to instance 0x4ddc6c0' 
*** Call stack at first throw: 
(
    0 CoreFoundation      0x0111e5a9 __exceptionPreprocess + 185 
    1 libobjc.A.dylib      0x0153c313 objc_exception_throw + 44 
    2 CoreFoundation      0x011200bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187 
    3 CoreFoundation      0x0108f966 ___forwarding___ + 966 
    4 CoreFoundation      0x0108f522 _CF_forwarding_prep_0 + 50 
    5 0x00002a42 -[AppDelegate managedObjectContext] + 194 
    6 0x00003736 -[HomeViewController fetchFeedDataIntoDocument] + 134 
    7 Amsterdam     0x0000417d -[HomeViewController refresh] + 45 
    8 Amsterdam     0x0000803f -[MBProgressHUD launchExecution] + 143 
    9 Foundation       0x00ae2cf4 -[NSThread main] + 81 
    10 Foundation       0x00ae2c80 __NSThread__main__ + 1387 
    11 libsystem_c.dylib     0x93393ed9 _pthread_start + 335 
    12 libsystem_c.dylib     0x933976de thread_start + 34 
) 
terminate called throwing an exception(lldb)

出典

2012-05-08 Danny Boevéé