You are only able to generate 1000 cards at a single time.That should be enough.

MacIllegal 1.0® 

Your card is invalid because it does not follow the numbering format of any known credit card.

Your card is not a valid Visa, MasterCard or American Express card.

Your card is invalid because it has an improper length.  It must be either 13 (Visa), 15 (AmEx), or 16 (Visa/MC) digits.

Invalid seed. No valid credit cards can be generated.

The seed number you have inputed won't generate valid credit cards  You cannot generate with that seed.