Facebook SDK 3.1 - Error validating access token?

The Facebook account on the device has become out-of-sync with the server as well as with the App's/SDK's cache. This can be solved by calling the ACAccountStore method renewCredentialsForAccount, which will update the OS's understanding of the token state.

I'm just going to contribute another thing to check that caused me to waste 3 hours: Make sure your FB app settings do not have the 'Sandbox' option on if you're trying to login with a non-app-developer FB user... Maybe obvious, but could save others a few hours hopefully.

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