error software update on a new installation

Tue Aug 16 14:51:23 UTC 2011

I am an Ubuntu user and now testing Fedora.
I have 360+ updates of software after installation.
But I get the following error.

could not add package update for fedora-release-rawhide-15-3(noarch)updates:
fedora-release-rawhide-15-3.noarch

To my knowledge I run Fedora 15 Lovelock

What is going wrong?
-- 
Peter
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