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Not sure if this is the right place to discuss this. Sometimes when I try to post a comment in any wiki this annoying message appears and my comment isn't posted. I have to log out and back in to get rid of it. It's getting really annoying. Why did this sometimes happen to me?
Clearing cache and cookies should help. Also try staying logged out for an hour or so. This isn't a problem on your end, it's likely the wiki's server is malfunctioning and not able to write to the sessions directory. This can mess up the cookies so if you clear them and it still doesn't work then you might just have to wait until the issue is fixed.