The IRS uses reference code 9001 to indicate a "Systemic error/issue". In other words, it's a system problem and likely not a problem with your return. Take a deep breath, wait a day or two, then try again. The IRS won't start processing your return until at least today (the 28th) or tomorrow anyway, so give it a day and try again.
**Say "Thanks" by clicking the thumb icon in a post. **Mark the post that answers your question by clicking on "Mark as Best Answer"