We do not know what exactly you entered--we cannot see your screen. Check all of the entries you made in My Info for him--you might have put something in incorrectly. See if you entered the correct date of birth, see how you answered the weird question about whether he paid for over half his own support (say no), see if his SSN is correct. You say his mother cannot claim him---explain please. You say the other parent cannot claim him. Did you answer a question about a 8332 agreement? How did you answer it?
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
