Why is 2017 related to my problem filing now?

[LinaJ2018]

Are you referring to the 2017 AGI?   This is the requirement set by the IRS.  They ask you to manually enter the amount to verify your identity when you e-file your 2018 return.

If you filed with TurboTax or have an original copy of 2017 tax return, locate the amount by clicking here   2017 AGI .

Or 

The best and fastest way to access the 2017 AGI is to order a transcript from the IRS.  Click here  Get Transcript and select "Get Transcript Online " On the transcript, look under section "Adjustment to Income" and find the amount for Adjusted Gross Income.