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I am trying to create a PostGIS extension for my PostgreSQL database when running a single-user mode by using the following command:

echo "CREATE EXTENSION postgis;" | su postgres sh -c "/usr/lib/postgresql/9.2/bin/postgres --single -D /var/lib/postgresql/9.2/main --config_file=/etc/postgresql/9.2/main/postgresql.conf dbname"

which returns

UTC ERROR: type reclassarg[] does not exist

I am doing it while deploying a Docker container, so I cannot use psql since the database is not running at this moment. After the Docker deployment is finished and the database is started, running psql -d dbname -c "CREATE EXTENSION postgis;" works like a charm which means that PostGIS is installed.

What does this type reclassarg[] does not exist message mean and how can I create the PostGIS extension from the single-user mode?

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