3D000: invalid_catalog_name

What does it mean?

The database you are trying to connect to or access does not exist. No database with the given name was found.

Why does it happen?

A misspelled database name in the connection string; the database not yet created or dropped; case sensitivity; connecting to the wrong server; a wrong name in the environment (env) configuration.

How to fix it

List existing databases: psql -l or SELECT datname FROM pg_database. Correct the database name in the connection string. Create it if needed: CREATE DATABASE database_name; Verify that you are connecting to the correct server/port. Check the DB name in the application configuration.