As title says, but I will add some details when and why. Usually everything is fine, but once mod creator starts using token cards for choices, or maybe reprints some cards and will reuse the descriptions of original cards, then the message that a CardString for ID doesn't exist whenever new instance of a card is created, which can quickly get out hand when looking at card library, which constantly makes new instances, and the logs with a lot of some unwanted text.
EDIT: I made a mistake, when it comes to amount of instances of cards that are created normally.