Not other than to point you to the thread which has some troubleshooting steps.
https://forum.freecodecamp.org/t/running-the-relational-database-curriculum-in-your-browser/500231
Did you try using a new Replit boilerplate? When do you get the error message?
If Replit isn’t working you can:
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Complete it running locally.
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Try using Glitch.