facebook ios sdk log : strange message

Question

I've got a button to share an image and every times I click it, I've got this message in the log, I dont understand :

2012-08-12 19:21:30.511 AvisOcean[2239:707] An instance 0xe6b8fe0 of class FBSessionManualTokenCachingStrategy was deallocated while key value observers were still registered with it. Observation info was leaked, and may even become mistakenly attached to some other object. Set a breakpoint on NSKVODeallocateBreak to stop here in the debugger. Here's the current observation info: ( Context: 0xa5e90, Property: 0x245310> Context: 0xa5e90, Property: 0x28c400> )

Any ideas?

Answer 1

The Facebook SDK is leaking observers. I am using SDK v3.1.

This shouldn't be an issue if you are using the SDK without the deprecated headers (ie Facebook.h). But to use native dialogs you need to include the deprecated headers (source: https://developers.facebook.com/docs/howtos/feed-dialog-using-ios-sdk/) which leads to this error when closing/cleaning the active session.

Here is a pull request to fix it: https://github.com/facebook/facebook-ios-sdk/pull/474

You can then rebuild the SDK using Facebook SDK for iOS6/Xcode 4.5 not working