Can't upload source package to ppa

 I've tried uploading a source package, and it gets rejected with the following error.

=========
Rejected:
Unable to find distroseries: unstable
Further error processing not possible because of a critical previous error.

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Hash: SHA1

Format: 1.7
Date: Fri, 11 Apr 2008 16:14:53 +0800
Source: fivedash
Binary: fivedash
Architecture: source all
Version: 0.7-2
Distribution: unstable
Urgency: low
Maintainer: Maple Zhou <email address hidden>
Changed-By: Maple Zhou (programer) <email address hidden>
Description:
 fivedash - General purpose accounting for small business
Changes:
 fivedash (0.7-2) unstable; urgency=low
 .
  * Initial release (Closes: #nnnn) <nnnn is the bug number of your ITP>
Files:
 35b11f21dbc2e0e22ecafe1ee90710d9 572 web optional fivedash_0.7-2.dsc
 6e32748b18040212d31f4bdc04c6cd56 5996 web optional fivedash_0.7-2.diff.gz
 e1035d1afd68dc1015bcb40085c4810c 420838 web optional fivedash_0.7-2_all.deb

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iD8DBQFH/yKrO+5rWtqE6aERAu3qAJ9QjOeDjBXkVEmN5QXWDR6rjeBsJwCcC3K3
E+LYHvtrKT/wVY0mHFq5YZY=
=HCGj
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If you don't understand why your files were rejected, or if the
override file requires editing, reply to this email.
===================

I repied this email, however,I geted the following email from <email address hidden>

======
This is an automatically generated Delivery Status Notification

Delivery to the following recipient failed permanently:

    <email address hidden>

Technical details of permanent failure:
PERM_FAILURE: Gmail tried to deliver your message, but it was rejected by the recipient domain. The error that the other server returned was: 550 550 <email address hidden>: Recipient address rejected: User unknown in virtual alias table. We recommend contacting the other email provider for further information about the cause of this error. Thanks for your continued support. (state 14)

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       Fri, 11 Apr 2008 04:10:58 -0700 (PDT)
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Message-ID: <email address hidden>
Date: Fri, 11 Apr 2008 19:10:58 +0800
From: "binbin zhou" <email address hidden>
To: "Launchpad PPA" <email address hidden>
Subject: Re: fivedash_0.7-2_i386.changes rejected
In-Reply-To: <-2229702910455983532@unknownmsgid>
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Why did Lauchpad reject my source package?

2008/4/11, Launchpad PPA <email address hidden>:
>
> Rejected:

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