You are correct, I did miss the 2018 question and apologize.. Without being able to look at your return, I cannot tell what caused that error. This is a situation where in depth analysis is needed.
I would not advise you to just zero out the carryover. I know that you have been working on this and don't want to give you advise to do things that you have already tried.
What we would like to do is get a diagnostic copy of your return and analyze it with our software. A diagnostic copy is sanitized and removes all of your personal information.
In Online TurboTax go to Tax Tools, Tools, Share My File with Agent.
In Desktop TurboTax, it is at the top under Online.
Just post the six digit token number and we will research this for you.
