If the primary taxpayer is under the age of 16 and has never filed a tax return, then the PIN on the return must not have the value of the self-select practitioner.
Fix #1: Sign into your account and follow the on-screen instructions to update the PIN provided.
Fix #2: If you do not have a valid PIN, you can still file by filing Form 8879. To do so, sign into your RapidTax account and follow the on-screen instructions.
Fix #3: Paperfile your return by signing into your RapidTax account then printing, signing, and mailing it to the IRS.