A little humor:
It would be nice if Ancestry (and the other sites) had a notice that said:
Please compile your tree again.
The tree submission could not be completed because your submission did not make any sense at all, violated the laws of time and space, and shows a blatant disregard for accuracy.
While we all make mistakes, we have likely seen trees where the issues are larger than the occasional error or lapse in genealogical judgement.