Links lead to a 404 Error page
If you get a 404 error when clicking on author, publisher, genre, or source links, this is likely because you've forgotten to refresh your permalinks. This can be done by visiting Settings > Permalinks and clicking "Save". You don't need to make any changes - just click "Save".
If you want to disable these links entirely, go to Ultimate BB > Book Information and find the option called "Link to Taxonomy Archives". Switch that to "Off" and re-save the settings.