I'm getting the following error from Facebook when trying to post to a users stream.
Error validating access token: The session has been invalidated because the user has changed the password or because auth.expireSession was called.
The workflow is as follows:
Authorize with Facebook requesting
scope=offline_access,publish_streampermissions (if the current user has not already authorized)Do some work on the server (takes 5-10 minutes)
Attempt to publish to the user's Facebook stream
This code works for many users, but for some users, I get the Error validating access token error. It started frequently happening a few weeks ago, then seemed to stop, and now happen a lot again. I'm certainly not calling auth.expireSession on my end, and it seems unlikely that multiple users would be changing their password in the 5-10 minute window from authorizing to publishing. Does anyone know what might be causing this?
Anytime you get this error, you should run the user back through the auth flow. There are many reasons that either the user or we will invalidate a session. We have a how-to on this at https://developers.facebook.com/blog/post/500
来源：https://stackoverflow.com/questions/5972901/getting-error-validating-access-token-from-facebook-for-some-users