Hello. I have downloaded this app to read my book. I have downloaded my book, the app and done everything accordingly as suggested but when I open my book in the app and try to change pages, it doesn't do that except for the book cover and the first page. It shows the page numbers to be changing while scrolling but the pages do not change. Please help me as soon as possible bcoz my classes have started and even got some work to do from this book. But due to this app, I am unable to do it.