我的应用集成了 facebook sdk 3.1。它在 iOS 6 上运行良好，但在 iOS 5 上崩溃。我在控制台中收到以下错误。
2012-11-08 12:57:04.529 FMB[3446:c07] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[FBSession handleDidBecomeActive]: unrecognized selector sent to instance 0x6977300'
*** First throw call stack: (0x1b54052 0x129bd0a 0x1b55ced 0x1abaf00 0x1abace2 0x695f 0x40922c 0x40aa66 0x419743 0x41a1f8 0x40daa9 0x22adfa9 0x1b281c5 0x1a8d022 0x1a8b90a 0x1a8adb4 0x1a8accb 0x40a2a7 0x40ba9b 0x2ed2 0x2e05) terminate called throwing an exception