my yum update error

To: "For users of Fedora Core releases" <fedora-list@xxxxxxxxxx>
Subject: my yum update error
From: "Kumara" <kumara.jayaweera@xxxxxxxxx>
Date: Tue, 15 Mar 2005 07:42:20 +0300
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Reply-to: Kumara <kumara.jayaweera@xxxxxxxxx>, For users of Fedora Core releases <fedora-list@xxxxxxxxxx>

Hi all,
when i try to execute "yum update" i get this error (i have attached it
here) . pls help me.
Mohan

Attachment: key.dat
Description: Binary data