1099-R

On my 1099-R form Box 7 is distribution code 7, IRA/Simple box is marked "X".  Turbo Tax will not let me e-file my Fed and/or State Returns because it is calling for Box 9A to have a number.  This is my third distribution in the last three years.  Neither of the previous 1099-R forms had Box 9a filled in with a number.  I have rechecked my returns and everything seems to be correct.  What am I missing or have filled in wrong?

Please HELP!!