Hi. I am relatively new to this. I have created many epub files in the past for kindle, but there were no errors with the amazon kindle validation tool. However, now I am trying my hand at creating an epub for smashwords, using the same epub file with the EpubCheck version 4.0.2.
It generated the error below. It mentions the line and position, but unsure if this an actual visible error in that location that I can 'delete' or some invisible code there that must be omitted or corrected. I am perplexed and would appreciate any help in how to rectify this:
Type:ERROR
File:OEBPS/content.opf
Line:11
Position: 31
Message:
Date value 'September' is not valid as per
http://www.w3.org/TR/NOTE-datetime:[For input string: "September"] is not an integer.