It looks like this extension may be incompatible with CKEditor. We’re unable to edit our wiki when this extension is enabled. Has anyone run into this error?
Seems your wiki is in HTTPS but the websocket is using HTTP by default and you might need to configure this, see http://extensions.xwiki.org/xwiki/bin/view/Extension/WebSocket and especially websocket.ssl.enable.
Note: I don’t know anything about this extension. It says “DEVELOPED BY XWiki Development Team” but this is not correct 
(needs to be fixed). I’m just passing along an answer provided by Caleb who’s the author of this extension…