objective-c - iPhone 在 Facebook 上分享照片

Question

我正在使用 facebook SDK 在 facebook 上分享照片，它在模拟器上运行良好，但在设备上崩溃了。谁能帮我摆脱这个？

崩溃日志：

observeValueForKeyPath:ofObject:change:context: message was received
but not handled. Key path: state Observed object:     FBSession:
0x62a8b10, state: FBSessionStateClosedLoginFailed, loginHandler: 0x0,
appID: 478897658797357, urlSchemeSuffix: ,
tokenCachingStrategy:<FBSessionTokenCachingStrategy: 0x628d1d0>,
expirationDate: (null), refreshDate: (null), attemptedRefreshDate:
0001-12-30 00:00:00 +0000, permissions:( "status_update" )