The problem is that whoever made that ePub did not follow the Mobile ADE specification.
Contact the publisher and let them know that the eBook is not made following the Mobile ADE specification and that it does not work with your Sony Reader.
Also contact BooksOnBoard and tell them of this problem and request either your money back or a credit.
But before you contact BooksOnBoard, you could strip away the DRM and use Calibre to convert it to ePub so it would work on your 505.
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