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We can't actually explain that one any better than it explains itself!
We hear of that message on occasion. It's even popped up for me before. It might (we suspect anyway) have something to do with internet conditions at the moment of posting. It's a pretty tough one to figure out, because by the next time you click post it always goes through. It has also occurred to us that the error could have the wrong text attached to it, but again it is a hard one to chase down.
Unfortunately until we can reproduce it on a reliable basis we can't get anything done to fix it.