aNobii WordPress Widget is a WordPress widget which shows randomly the covers of some books from your aNobii's shelf.
Probably, you have to configure it under "Options->aNobii Plugin".
Probably, you have specified a "customized" url in the preferences, such as http://www.anobii.com/people/jhack: it will never work! You must retrieve your user-id from the Feed RSS url near to the bottom of your aNobii's Home Profile.
Therefore the url you must provide must be something like http://www.anobii.com/people/010c51b082b89840a7.
= The URL is correct now, but I can't see any cover
Check if the file "proxy.php" (and the directories which contain it) have the correct permissions. It depends on your host, so I can't say what are the best configurations. For me, 755 for the directories and 644 for "proxy.php", but on different hosts the latter one needs 755.
I don't know what could be your problem. Please write a topic and I'll try to understand and correct your problem.