UUID generation problem

I have a FreeBSD-12.1p10 system running postgreSQL-11.8. This is a test
platform for Idempiere. When creating a new client in Idempiere I get this
error message:

** org.postgresql.util.PSQLException: ERROR: function uuid_generate_v4() does
not exist Hint: No function matches the given name and argument types. You
might need to add explicit type casts. Where: PL/pgSQL function generate_uuid()
line 3 at RETURN

This usually means that the uuid-ossp extension is not active in the database.
However, I previously installed this and psql shows that it is present:

sudo -u postgres psql --dbname=idempiere
psql (11.8)
Type "help" for help.

idempiere=# \dx
List of installed extensions
Name | Version | Schema | Description
-----------+---------+------------+-------------------------------------------------
plpgsql | 1.0 | pg_catalog | PL/pgSQL procedural language
uuid-ossp | 1.1 | public | generate universally unique identifiers
(UUIDs)

The owner of the idempiere database is idempiere_dbadmin and this is the user
that is attempting to generate the UUID.

idempiere=# \l
List of databases
Name | Owner | Encoding | Collate | Ctype |
Access privileges
---------------------+-------------------+----------+---------+-------+-----------------------
idempiere | idempiere_dbadmin | UTF8 | C | C |

What is the problem?

--
*** e-Mail is NOT a SECURE channel ***
Do NOT transmit sensitive data via e-Mail
Unencrypted messages have no legal claim to privacy
Do NOT open attachments nor follow links sent by e-Mail

James B. Byrne mailto:ByrneJB(at)Harte-Lyne(dot)ca
Harte & Lyne Limited http://www.harte-lyne.ca
9 Brockley Drive vox: +1 905 561 1241
Hamilton, Ontario fax: +1 905 561 0757
Canada L8E 3C3