first time epub file creator having issues

[isthisonetaken]

Trying to upload file to Ingram Spark and consistently receiving the following error message. Please see screenshot. I have no idea to go about correcting it. Help! 

[Derek Cross]

Looks like there's an issue with an Ordered List.

Try the IDPF validator to see if it throws up more info.

http://validator.idpf.org

[isthisonetaken]

Thank you for this! The IDPF validator has a 10MB limit and my file (a children's picture book) is much larger. Got an error message from IDPF. Thoughts?

[Derek Cross]

If you are hoping to convert this ePub to mobi format to sell via Amazon, have a look at their spec to check out the implications of the size.

It might be worth taking out a month's worth of Flightdeck to check your ePub in detail.

https://ebookflightdeck.com

Are you on a Mac?

[Tarajandrews · Accepted solution]

I had this same issue and it is because you need to export a Table of Contents with the file. 

Make sure to select a Navigation TOC (even if the book doesn't have one) and then select the default TOC style.

[isthisonetaken]

Is the "Navigation TOC" something I choose as I am creating the ePub file in inDesign or is it something I select in Document Setup? 

[Tarajandrews]

Hi,

It is during the EPUB export process in the General section. The default has nothing selected.

Tara