to contest the issue of knowing there was a mistake would be an implied knowing of the contract and since you knew of the contract you can not claim that you did not know. See makes WAY more sense.
Printed copy · Anthology Volume 9, page 1516Printed copy from The Tender For Law Anthology, Volume 9, page 1516 (printed 13 June 2014). Added by this site; not part of the Facebook export.