Here's the full quote from Smashwords:
As per Section 20 of the Style Guide, please supply an EPUB with at least two working items in the NCX. Otherwise, some vendors will reject your book.
Can someone translate that into English, please.
(English is my native language.)
ADDED: My short story was written and finished in Scrivener. However, I started it in Word (I think), and then switched over from a PC computer to my wonderful 5-year old MacBook Pro.
In quickly looking over the 'details' for this error report from Smashwords, it appears to have something to do with Word. However, a FIND query using Firefox using 'NCX' turned up nothing, and yet that is what the report is concerned with.