ERROR: array value must start with "{" or dimension information

I am trying to INSERT a record in my postgres table and I get t his error:
ERROR:  array value must start with "{" or dimension information

My table definnition
CREATE TABLE paymentmethod
(
  code varchar(1) NOT NULL,
  description varchar(30)[] NOT NULL
)
WITH OIDS;
ALTER TABLE paymentmethod OWNER TO postgres;
GRANT ALL ON TABLE paymentmethod TO postgres;
COMMENT ON TABLE paymentmethod IS 'Payment Method Table';

My Insert SQL:

insert into paymentmethod
values('A','ACH');

Do you know what might be causing the problem?
waipahuAsked:
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ravenplCommented:
You have to do insert into arrays this way:

insert into table_name values (1, '{"string1"}');
insert into table_name values (2, '{"str1","str2","str3"}');

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earth man2Commented:
Alternative syntax is to use array keyword with square brackets.

insert into paymentmethod values('A',ARRAY['ACH'] );
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PostgreSQL

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