HELP - PROBLEMS SIGNING UP FOR STAMPIN' UP! US STARTER KIT

Each time I attempt to sign up I receive the following message:

The item(s) below is no longer available. To remove the item(s) from this order, click OK, then remove any payments from the order and delete these items from the Merchandise and/or Hostesss Free items tab before completing your order.

125855 Celebrando 2011-2012 (Single)

It will not allow me to continue to the Summary/Payment page until the item is removed.  Unfortunately, it is an item from the Starter Kit that I am unable to substitute. Does anyone have any ideas? Thanks, Ivy