A married filing separately tax return only requires the 2018 AGI for the person filing the return. If that is what you entered and it is being rejected, try entering the number 0 instead of your 2018 AGI. That will often work when the IRS database has the incorrect or no AGI for you. If that doesn't work, you will have to print and mail your return.
MFS the only agi that should be entered is the one off your 2018 return. do not enter hers. if you file after 10/15/2019 try 0. sometimes nothing works and you will have to mail in your return. must be postmarked by midnite tonite if you owe.
if you were married on 12/31/2019 you and spouse may end up paying more in taxes filing MFS than filing joint