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This can, to my knowledge, have two causes: The first one would simply be that there already is a service listening on port 8080. Are you running any other servers apart from the Calibre one?
The second reason you may get this message is because of the Windows firewall- from what I read (I've never actually seen that behaviour myself), the Windows firewall sometimes reports back an IP of 0.0.0.0 if a connection is refused. Check your firewall settings in the control panel and see if opening listening ports is allowed.
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