"Error class:
Uncorrected: When every printed version of that card has the same error. Since every card has the same error there should be no added value. In a set list, there should be note of Uncorrected Error.
Corrected: When a card is first produced with an error and later runs correct error. The more valuable card is the harder to find one.
Production: When a run of cards of cards have the same error that differs them from the rest of run. Examples d Edition Butterfree, Dialga G LV X yellow Fire energy. This error usually has added value.
Printer: When a single card or a very small run of cards have the same error. Normally smudges, miscuts alignment errors. Value is variable and discretionary."
Thanks for posting that in my thread, it should help alot of people!