Error Validating access token: Session does not match current Stored session

Hello,
I noticed, when I compose a blog post, I still have an error on the composiition interface:

Error Validating access token: Session does not match current Stored session. This May be Because The user changed the password since the time the session Was created or Facebook Has Changed the session for security Reasons.

That said, this does not prevent that the blog post is validated and registered but it is strange ...