Create Function... ERROR: language "plpgsql" does not exist

I copied an example from the help:

CREATE FUNCTION somefunc() RETURNS integer AS '
DECLARE
quantity integer := 30;
BEGIN
RAISE NOTICE ''Quantity here is %'', quantity; -- Quantity here is 30
quantity := 50;
--
-- Create a subblock
--
DECLARE
quantity integer := 80;
BEGIN
RAISE NOTICE ''Quantity here is %'', quantity; -- Quantity here is
80
END;

RAISE NOTICE ''Quantity here is %'', quantity; -- Quantity here is 50

RETURN quantity;
END;
' LANGUAGE plpgsql

Ran it is a SQL window from pgAdmin and got this error:

ERROR: language "plpgsql" does not exist

Thanks,
Thomas LeBlanc

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