The AGI you have entered is not matching the IRS record. You can request an online transcript or a copy by mail from the IRS website.
If the IRS keeps rejected your return, you can print it and mail it in.
could you clarify by what you mean you did a single file and a joint with your husband
If you filed a Joint 2018 return then you enter the same AGI for both/each of you to efile 2019. There is only one AGI on a Joint return.
Sorry to ask but did your spouse die in 2019? There is a problem with Efiling when one spouse died during the year. You have print and mail your return this year.