Error checking for Index autogeneration.
Error checking for Index autogeneration.

gitenberg-dev/HTMLBook,macmillanpublishers/HTMLBook,wastemobile/HTMLBook,gitenberg-dev/HTMLBook,oreillymedia/HTMLBook,gitenberg-dev/HTMLBook,mushroomgithub/HTMLBook,oreillymedia/HTMLBook,macmillanpublishers/HTMLBook,macmillanpublishers/HTMLBook,mushroomgithub/HTMLBook,mushroomgithub/HTMLBook,wastemobile/HTMLBook,oreillymedia/HTMLBook