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It usually happens if the connection is made to the server but the wrong database is selected, or your user account doesn’t have the right permissions to view the tables. Double-check that:

You’re connecting with the correct database name.
The user has privileges to access and view tables.
Tables actually exist (sometimes they don’t get created if migrations or imports fail).
If you want a step-by-step check on database setup and common connection issues, this guide may help: https://barberhairfade.com/