EPub file errors w hen uploading to IngramSpark

Sigh. I am trying to upload my compiled ePub file to IngramSpark. I get this error:

(RSC-005): /OPS/body48.xhtml: Error while parsing file: The element type “div” must be terminated by the matching end-tag “”.

Does anyone know what this means, and more importantly, how I might fix this in the compile settings in Scrivener so that I can fix it?
I’m working on Scrivener 3 for iMac (Mojave)
Thanks for any help you can give.

In the right-hand pane of the main Compile screen, under the “gear” icon, there’s an option to save the component files of the ePub to a folder. If you do that, you can see what’s in “body48.xhtml” and refer back to the corresponding document in the Binder of your Scrivener project.

Also, what version of Scrivener do you have? A number of bugs related to ePub compilation have been squashed since Scrivener 3 was released.