Error Message: Effective date of S corp election is later than beginning date of tax year

I am having to late file my 2018 S Corp return but I get the error message "You have entered an S corp effective date that is later than the first of the year".  It was my first year and the business did not start until 10/5/2018.  Turbotax will not let me efile with this error and my state requires efile.  The help instructions mention a 'short year' return but turbotax only appears to allow calendar or fiscal year.  Please advise...thanks!