[Mrs. Don-o]

"Is there an error of doctrine in your Catechism?"

There are different levels of authority, and different levels of clarity or precision, even in a catechism. But nothing presented as binding on all the faithful is false.

[ears_to_hear]

The catechism contains the doctrine of the Roman Catholic church.

If there is "nothing binding" If there is an "error" I would like to know which is error, That only Christ could keep the whole law perfectly, or that Mary also kept the law perfectly?

Only one can be true ...