I received a letter that says "schedule 1 is incomplete or missing from your return. Complete the schedule with information that supports $250.00 on line 8a, form 1040. Also, attach all supporting forms or schedules as required." I found my pdf which contains schedule 1 with the adjustment to income applied on line 10 as educator expenses for 250. What do I have to do? Do I print out schedule 1 again or do I provide proof (receipts) of my educator expenses?