Alright, I've been googling non-stop (2 years) to find an answer to fix this
ERROR(RSC-005): ./books/Bo/databases/eBookIt/temp_uploads/1636565401.epub/index_split_000.xhtml(2,60): Error while parsing file: attribute "class" not allowed here; expected attribute "dir", "lang", "version" or "xml:lang"
If someone could please put this into terms, I would understand. I would GREATLY appreciate it.