If you are getting the message because you did not check the box in Personal Info that you can be claimed by someone else, then just go to Personal Info and check the box and resubmit your efile.
This message more often occurs when someone has used the non filer portal to register for the stimulus payment. If you did that, then here is what you will have to do to submit a return: https://ttlc.intuit.com/community/tax-topics/help/stimulus-how-to-file-your-return-after-getting-rej...
