Product state not changed: Magic Box items which are not limited quantity can not be listed.

[Demon Aker]

how is this fixed

[Rolig Loon]

Fixed?  Unless you are listing one-of-a-kind items (like breedables), you must upload them to Marketplace with the Merchant Outbox in your viewer.  You are not allowed to use a Magic Box for anything but one-of-a-kind items.

See http://community.secondlife.com/t5/English-Knowledge-Base/Selling-in-the-Marketplace/ta-p/700193#Section_.4