State Tax Error Line 6a

Good evening.  My Federal Taxes checked out so now I'm doing the analysis of my state income taxes and it keeps saying there is 1 error.  It shows me the 1040 form and displays "Schedule CA: Ln 6-Fed SS benefits amt must be entered."  We don't get Federal Social Security benefits and don't have an SSA-1099, so there's no amount to enter.  Earlier in the walk-through when it asked if we get Social Security income, we marked "no."  The box in error on the 1040 is under column A (taxable amounts from your federal tax return) next to line item 6a and is highlighted in red.  It will not let me enter either letters or numbers into the box.  I have repeatedly re-entered our W2 information and redone the "income" section of the federal return.  Is there something I'm doing incorrectly?  Thank you.