BOX 15 - State -doesn't offer TN state in the drop down. I'm getting a RED triangle along with the message "We found something wrong with your info." What are my options?

Several  states do not have a state income tax.  So these states will not show up in certain drop down lists.   Leave boxes 15, 16, and 17 blank when you enter a W-2 for these states.

Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington and Wyoming