Hi, I was just posting this because I was surprised to get this error and in case it helps in diagnosing anything else that might be going on inside of the forum. I've only started receiving the "Unexpected Error" and the button that says "press here to return to original page" (or something of the like. Which I have received just a handful of times in the past week. It is easily remedied by simply backspacing from the error page and re-submitting.
As I said, just reporting it as it is no kind of real issue to me.