Error on updating to squeeze from lenny

Make Compile makecompile at
Fri Feb 11 02:50:02 MST 2011

I've encountered this error while trying to migrate from lenny to squeeze.any ideas would be much appreciated. Tnx

GPG error: stable/updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY AED4B06F473041FA
W: You may want to run apt-get update to correct these problems

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