If you are experiencing this error, there are many possibilities.  Currently the most likely is that you signed into Hangouts from a mobile phone.  If you turned off the phone or closed the app without signing out first, you have created an orphan session on the Hangouts server.  Unfortunately all you can do now is wait for it to expire - reports are that this takes up to 30 days.

Here is a list of some other common applications that cause this:

    Google Talk (stand alone client)
    Google hangouts
    Web services such as eBuddy, Boxbe, splashtop streamer, mobileMe, Talkatone, Beejive
    Mobile phone apps including Gmail on some phones
    Any other third party chat client/social network that connects to your Google account might do the same.

    Enabling SMS extensions - clear them here: https://www.google.com/settings/smsextensions/
    Apple Messages (thanks to swchristensen, 21 Nov)

We don't need a new version of OAuth 2. The current version provides sufficient options for developers to implement most types of applications. Many services such as Facebook, Github, and Google have already deployed OAuth 2 servers, and deployed implementations win. The OAuth 2 spec itself leaves many decisions up to the implementor. Instead of describing all possible decisions that need to be made to successfully implement OAuth 2, this post makes decisions that are appropriate for most implementations.

This post is an attempt to describe OAuth 2 in a simplified format to help developers and service providers implement the protocol.

This document provides all the basic information you need to start using the library. It covers important library concepts, shows examples for various use cases, and gives links to more information.

La page d'accueil entrée à la documentation de la nouvelle API calendar.

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