What is it? Why can't I defile without it?
Sounds like a state form. In any case, efile is not open for 2016 yet. You must wait.
There's no hurry to file. Turbo Tax won't start taking returns for a couple weeks and then they just hold them until the IRS opens Jan 23. The IRS will open efiling on Jan 23, 2017 https://www.irs.gov/uac/2017-tax-filing-season-begins-jan-23-for-nations-taxpayers-with-tax-returns-... IRS warns of refund delays https://www.irs.gov/individuals/refund-timing