Not too sure what the "error upload" means here. However, I did notice that the pages themselves are different images even if they are the same page. So I'm not entirely sure if this means the pages were just scanned/edited again or if there are missing pages. It might be easier to just double check on your end and try and figure out if there are missing pages than to fully reupload everything. If you do end up needing to send me the chapter, we can try to work that out.