Reject Code F1040-516-01 cannot find the issue

[chesnikb]

says my federal and state returns have been rejected and after I checked social security number it is correct. how do I change dependents

[LeticiaF1]

This return was rejected by the IRS, because the taxpayer's SSN has already been entered as a dependent on another return. If you were supposed to be claimed in another return, you need to indicate it on the return.  

First verify that the taxpayer's SSN has been entered correctly. If the Taxpayer's information is correct and you want to file electronically, you will need an Identity Protection PIN. Visit Get an identity protection PIN (IP PIN) for further information.