An IRS notice was sent rejecting an amended return with the following instructions:

Schedule 8812 is incomplete or missing from your return. Complete the schedule with information that supports [refund amount] on line 18b, Form 1040. Also attach all supporting forms or schedules, as required. 

Schedule 8812 was sent along with the amended 1040x. Is it possible that the IRS also wants to see the schedule 8812 worksheet? The worksheet was not sent out. 

we went over schedule 8812 and everything appears fine. Now, the only amount that we cannot figure it out where it came from is line 1 of the schedule 8812. The schedule 8812 worksheet has a 0 for line 8 and the schedule 8812 has an amount there. 

Can anyone shed some light?