This reject code means that the person with the Primary SSN on your tax return -- the taxpayer listed first -- has been claimed as a dependent on someone else's tax return, and you didn't indicate on your own return that someone else would be able to claim this person.
If no one else should've been able to claim this person on their return, you'll need to print and mail your return. You won't be able to e-file.
On the other hand, if someone did have the right to claim the person with the Primary SSN on the return, please follow Rachel_W's instructions above.
Please see the TurboTax Help articles "How do I print and mail my return in TurboTax Online?" or "How do I print and mail a return in the TurboTax for Windows CD/Download software?" as appropriate for the instructions on filing your return by mail.
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