topics not displayed it Chrome when output from Robohelp 9

I'm using Chrome version Version 31.0.1650.63 to view a site created with Robohelp Webhelp 9. The topics associated with books do not display in the browser. I get a "file or directory cannot be found" message when I click a book. These topics can be displayed by clicking links that reference these topics. Topics beneath table of contents books also display in Chrome. I have the same problem with Firefox, but not IE. How can I make book topics appear in Webhelp when viewed with Firefox and Chrome?