None of us have the codes memorized; use your words and describe what the error says.
Or, try to file and see what happens?
If a post answers your question, click on *Accept as solution* for future searches
It could be related to IRS taking a well earned nap this long weekend. https://www.marketingexpress.irs.gov/systems-status/system-status-mef/modernized-efile-mef-operation...