apt-get size mismatch

From: sepp (birrrenweggen_at_hotmail.com)
Date: 07/26/04

Date: Mon, 26 Jul 2004 16:01:39 +0200

I'm using FC1. When I do a 'apt-get update' and 'apt-get upgrade', apt
fetches all packages and stores them in /var/cache/apt/archives/partial,
but it tries to fetch the same files again from the same server and stops
with the error
"size mismatch" There's an example
 Get:47 http://ayo.freshrpms.net fedora/linux/development/i386/core
compat-libstdc++ 8- [665kB]
Failed to fetch
Size mismatch

the first command succeeded, the file is on my disc, but the second failed.
No files are installed

what's wrong here?