when I update the confluence from 5.10.2 to 6.3.2 , I find the synchrony doesn't work so I can't edit the page
the logs are as below:
2017-08-09 14:52:46,889 INFO [http-nio-8150-exec-8] [plugins.synchrony.config.DefaultSynchronyConfigurationManager] retrievePublicKey [Collab editing plugin] Could not retrieve public key for real-time collaboration service at http://127.0.0.1:8091/synchrony/jwt-key. Status code: 404
2017-08-09 14:52:46,901 ERROR [http-nio-8150-exec-8] [confluence.plugins.synchrony.SynchronyContextProvider] getContextMap Could not retrieve Synchrony public key.
