[Launchpad-users] Package rejected

["TRINGALINVENT\@libero\.it" <TRINGALINVENT@xxxxxxxxx>]

I tryed to upload this package on my repository, but it has been rejected with the following message:

---------- Initial Header -----------

>From      : bounces@xxxxxxxxxxxxx
To          : "Zorba" TRINGALINVENT@xxxxxxxxx
Cc          :
Date      : Sun, 14 Feb 2010 08:05:31 -0000
Subject : veejay_1.5.2_source.changes rejected







> Rejected:
> PPA uploads must be signed by an Ubuntu Code of Conduct signer.
>
> Format: 1.8
> Date: Sat, 19 Dec 2009 19:38:26 +0100
> Source: veejay
> Binary: veejay
> Architecture: source
> Version: 1.5.2
> Distribution: karmic
> Urgency: low
> Maintainer: Niels Elburg <nwelburg@xxxxxxxxx>
> Changed-By: ZorbaProject <TRINGALINVENT@xxxxxxxxx>
> Description:
> veejay     - Veejay - a 'visual' instrument and realtime video sampler
> Changes:
> veejay (1.5.2) karmic; urgency=low
>
>   * 1.5.2 release
>
>   * 1.4-3 release
>
>   * Initial official release
> Checksums-Sha1:
> a801634010a36ebc6dc69b5d316ccbbe10b296d7 955 veejay_1.5.2.dsc
> 677ea8f279278a78c285ac6f535aea69d57ca8df 1298548 veejay_1.5.2.tar.gz
> Checksums-Sha256:
> 7c2d2b0a34234596d0896c8bb7ea585d295f503a1e3691b14300c3e9a47202de 955 veejay_1.5.2.dsc
> da8655528a9d7b54c3e8db329e39662ddcd06a69593c5dda5dfa9c82409e374e 1298548 veejay_1.5.2.tar.gz
> Files:
> b60f78bd06f33e985dba36e0324c0c61 955 video extra veejay_1.5.2.dsc
> 3ccf324948f3658ee088009652711b76 1298548 video extra veejay_1.5.2.tar.gz
>
>
> ===
>
> If you don't understand why your files were rejected please send an email
> to launchpad-users@xxxxxxxxxxxxxxxxxxx for help (requires membership).
>
> --
> You are receiving this email because you are the uploader of the above
> PPA package.
>



What have I to do?