I filed joint married for 2018 , but my status is divorced for 2019. The question is when i e-file, they require me to input AGI from 2018. i do it and get rejected

Since you have changed your filing status, try putting in $0 for your 2018 AGI.

That may work.

It does not work, thanks

If your 2018 was a joint tax return, the total AGI on the return is listed for each spouse.
 
In other words if the combined AGI is $60,000 on a joint return, you list $60,000 as the AGI for the taxpayer and $60,000 as the AGI for the spouse.
 
If this doesn't solve the problem, you may be able to retrieve AGI information from the IRS. 
 
Click here to access their AGI tool.