Though the ePub may get validated by the  ePubcheck but sometimes some errors may creep up that might affect the overall quality of the eBook. Here is a checklist that can be helpful in case you face such problems:- 1. epubcheck-3.0b4: Verify that the  ePub has passed “epubcheck-3.0b4″. If the ebook has any error, then… Continue reading »