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This should belong more in the ePUB subforum, since this is not a Sigil question...
Are you uploading an ePUB to Smashwords or use their Meatgrinder? If the first, check and repair your ePUB first. I don't know how this book was created, but it is done by someone not knowing a lot about e-books/ePUB...
For ePUB certain metadata is mandatory, like he language and title. So, this must be entered in the ePUB. Easiest to do this, is via an editor like Sigil. Most of them have a metadata editor to fix this.
Another thing is that there is a difference between HTML and XHTML. It seems that here HTML is used instead of XHTML. In XHTML 'name' is not allowed for anchors, it must be 'id'. More or less the same probably with the 'align'-error. The last error seems to be that an illegal tag is used for an SVG. Not sure without more information.
Run the ePUB through the validation in Sigil and ePUBcheck for more useful error messages and locations where these errors occur.
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