When trying to generate TOC from a book file I get the message book is not self consistent. I got rid of all the unresolved cross references but I still get the same message. What are the issues that will cause this problem?

The contents of generated files, the page count, or cross-references continued to change while generating and updating files in the book. For example, if a book contains both a list of markers and an alphabetical list of markers, and if both contain hypertext links, the number of markers grows each time the files are generated. If this happens, move one of the generated lists out of the Include scroll list when you use the Generate/Update command again. Regards Harpreet Adobe Systems

—"Book is not self-consistent"