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That's the error you get if your download fails. I'd suggest you try again. If it doesn't work please edit your question to include your console output.

Using an invalid url I get that errors:

wget http://packages.ros.org/ros.keyinvalid -O - | sudo apt-key add - 
--2011-11-26 12:48:22--  http://packages.ros.org/ros.keyinvalid
Resolving packages.ros.org... 157.22.19.137
Connecting to packages.ros.org|157.22.19.137|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2011-11-26 12:48:22 ERROR 404: Not Found.
gpg: no valid OpenPGP data found.

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