The Check book function has marked every html file with Unexpected empty source and noted line 1 column 0.
The first few lines are
Code:
<?xml version='1.0' encoding='utf-8'?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
What's the problem?
BTW, this is a book in which just about every CSS entry is a calibre class. It's the Maude translation of War and Peace. Duke Classics is claiming a 2012 copyright.