Duplicate entry '1' for key 1

I'm used the attachment_fu plugin, something has gone wrong here as I
tried to upload a picture.

ActiveRecord::StatementInvalid in PortfolioController#create

Mysql::Error: #23000Duplicate entry '1' for key 1: INSERT INTO
portfolios (`content_type`, `size`, `thumbnail`, `filename`, `height`,
`parent_id`, `width`) VALUES('image/jpeg', 45256, 'thumb',
'godjesus_thumb.jpg', 81, 1, 100)

as I try it a second time I recieve the same error except it states "
entry '2' " instead of " entry '1' "

Mysql::Error: #23000Duplicate entry '2' for key 1: INSERT INTO
portfolios (`content_type`, `size`, `thumbnail`, `filename`, `height`,
`parent_id`, `width`) VALUES('image/jpeg', 45256, 'thumb',
'godjesus_thumb.jpg', 81, 2, 100)

Still NOTHING happens in the portfolios-table...

I've been following the tutorial @
http://www.clarkware.com/cgi/blosxom/2007/02/24

You’ve set parent_id to be a primary key.

Ryan Bigg wrote:

You've set parent_id to be a primary key.

I've been following the tutorial @
http://www.clarkware.com/cgi/blosxom/2007/02/24
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>

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Ryan Bigg
http://www.frozenplague.net
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Ah, thanks. That was an easy one for you!
;D