The only thing I could think of, is if you used your "Online" account to file some other family member's, or friend's taxes last year.
You can't do that with the "Online" software. Only one person's (or couple's) tax return can be filed. Other tax returns must have an entirely separate Online account UserID/pwd.
_______
For desktop users, they can create a new tax file for other family members, but it must be created as a new file.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*