federal tax and state return was rejected

When trying to e-file my tax return, it was immediately rejected by Federal and State.  TurboTax then displayed the following error:

 

A Dependent SSN in the return must not be the same as the Primary or Spouse SSN on another return where ‘PrimaryClaimAsDependentInd’ or ‘SpouseClaimAsDependentInd’ is not checked.

This return has been rejected by the IRS because a dependent on this tax return, has filed their own tax return without indicating they would be claimed as a dependent.  The dependent’s Social Security number (SSN) cannot be used on two separate tax returns, without that indication.........

 

My dependent son is away at college and apparently filed his own return to get back a couple hundred dollars for taxes he paid during a summer job.  Apparently, he neglected to indicate that he would be claimed as a dependent on my return.  Is there any easy way to fix this?  Surely, this must be a common mistake.  Everything that I have read on old posts states that he needs to file an amended (form 1040X) by printing and mailing.  Additionally, I have read that I too need to print and mail my returns as well.  Is this really true?  My tax returns are over 100-pages long and it states that this might take months to process?  Do I also need to include a special note with my tax return stating exactly what happened?  Thank you for any help.