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我在這裏有一個堆棧跟蹤，但不知道什麼是錯誤的，並且控制檯屏幕上沒有明顯的輸出。FBLoginView：單擊登錄按鈕後拋出錯誤
> #0 0x01e1f09b in objc_msgSend()
#1 0x00096ebf in -[FBLoginView informDelegate:] at /Users/jacl/src/release/ios-sdk/src/FBLoginView.m:292
#2 0x00097104 in -[FBLoginView observeValueForKeyPath:ofObject:change:context:] at /Users/jacl/src/release/ios-sdk/src/FBLoginView.m:340
#3 0x01847ce7 in NSKeyValueNotifyObserver()
#4 0x018613f4 in NSKeyValueDidChange()
#5 0x01816630 in -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:]()
#6 0x018c335a in _NSSetIntValueAndNotify()
#7 0x0007c9ef in -[FBSession transitionToState:andUpdateToken:andExpirationDate:shouldCache:loginType:] at /Users/jacl/src/release/ios-sdk/src/FBSession.m:767
#8 0x0007b792 in -[FBSession openWithBehavior:completionHandler:] at /Users/jacl/src/release/ios-sdk/src/FBSession.m:350
#9 0x0007f2a6 in +[FBSession openActiveSessionWithPermissions:allowLoginUI:allowSystemAccount:isRead:defaultAudience:completionHandler:] at /Users/jacl/src/release/ios-sdk/src/FBSession.m:1558
#10 0x0007bff1 in +[FBSession openActiveSessionWithPublishPermissions:defaultAudience:allowLoginUI:completionHandler:] at /Users/jacl/src/release/ios-sdk/src/FBSession.m:545
#11 0x000973f9 in -[FBLoginView buttonPressed:] at /Users/jacl/src/release/ios-sdk/src/FBLoginView.m:391
有沒有人看到過這個錯誤？當我單擊FBLoginView中的登錄按鈕時發生這種情況