Foreign Key Problem

I'm using PostgreSQL 7.4, and I have two tables, which I created as follows:

CREATE TABLE needlestyle (
needle_style_id SERIAL,
needle_style_desc varchar(50) NULL,
needle_style_lud timestamp NULL,
PRIMARY KEY (needle_style_id)
);

CREATE TABLE needles (
needles_id SERIAL,
needle_style_id int NULL,
needle_mm decimal(5,2) NULL,
needle_length varchar(20) NULL,
needle_lud timestamp NULL,
PRIMARY KEY (needles_id),
FOREIGN KEY (needles_id)
REFERENCES accessory,
FOREIGN KEY (needle_style_id)
REFERENCES needlestyle
);

I filled the needlestyle table with three records. Then I tried to
run the following insert via phpPgAdmin and got the following error
message:

ERROR: insert or update on table "needles" violates foreign key constraint "$1"

In statement:
INSERT INTO "needles" ("needles_id", "needle_style_id", "needle_mm",
"needle_length", "needle_lud") VALUES
(nextval('public.needles_needles_id_seq'::text), '1', '2.25', '24"',
NULL)

What could be the problem?

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