Rejection Code IND-517-01 indicates that the first Dependent listed on your Form 1040 has already filed a Tax Return and claimed themself.
I recommend that you double check the return to see if your Dependent made a mistake on their return and didn't indicate that they were being claimed as a Dependent. If they did, they will need to Amend their Tax Return. If using TurboTax, as you walk through the TurboTax interview process you will need to answer "YES" to the question "Someone else can claim me as a Dependent" and "YES" to "and this person will claim me on their 2018 Tax Return". You can click here for instructions on Amending your tax return: How to Change a Tax Return You Already Filed.
If after checking your Dependent's return they did correctly indicate that they are claimed as a Dependent, then your only option is to mail in your Tax Return.
If your dependent did not file a return then your ONLY option is to print and mail in the return.
