Delaware Tax Question - unable to e-file due to error.

Good morning,

 

I am stuck in an endless loop of an error that I cannot clear.  The only option appears to be to file by mail, but I don't understand WHY the error is happening in the first place:

 

turbotaxhelp.jpg

 

I've reviewed the entire tax file three times, double checked all the numbers from our W2's and other documents, and it's still flagging for an error:

Screenshot 2026-02-08 11.30.09.png

 

I don't think this is a TAX error, I think this is TURBOTAX problem... Please help!

*This is on TurboTax Do It Yourself Deluxe edition.