The IRS - not eFile.com - has rejected your return and you are required to make a correction because of a self-selected PIN or IP-PIN.
Solution: Please sign in to your eFile.com account now and click on My Return in the upper left and review the IRS message on the right.
1. Sign in: https://mytaxes.efile.com/1040/SignIn/
2. Click on Name & Address and the left and verify that the primary taxpayer birth date is completed and correct. If you used a self selected PIN last year when you filed via eFile.com, you can use that or the last year AGI during checkout.
If you are asked to enter an IP-PIN, you can enter you existing one or get a new one here: https://www.efile.com/ip-pin-and-irs-account/
If you have questions, please contact us as soon as possible so we can assist you with your Tax Return.