Endless.

People don`t stop learning mistake in their entire life.
It`s not like you mistaken or did this problem wrong for one time and you get your lesson and hundredly percent comfirm if this kind of problem happen again , it won`t be your fault anymore just because you got your lesson. If the same thing happen, it means you just still haven`t realize it from you first mistake.

ps : I hope everything will be fine soon :(