Bonjour Susan !

Thanks for reporting that lesson: there was indeed a mix up in the text of it, that had been inverted ! Words like "matinée", "soirée", "journée" and "année" are feminine, and "matin", "soir", "jour", and "an" are masculine.
It's now been fixed, please have a look: An vs année, matin vs matinée, jour vs journée, soir vs soirée to express a time unit or a duration in French

Merci et à bientôt !