I was able to resolve the issue, and you may get a kick out of why.
I researched the toc.ncx and found that it was using the same reference for the beginning of the file and the midpoint. When I removed the code for midpoint the problem went away.
But then I was not able to upload the corrected file because they only accept doc files.
After a little more experimenting, I found out that the whole problem was because I did not include the required title page. When I added that, the epub verified without any issues. Arrgh
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