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Barry, can you give us more details about your source file?
You say you don't know what epub is - the main core of an epub is a html file, containing your text. And to get a valid epub file, your html file has to be valid xhtml 1.1. If it ain't valid, the whole epub will never be valid.
So I would recommend you use a validator from the internet to see if the source html file is really xhtml 1.1 valid.
I don't know this Meatgrinder (I only know a music band with that name). There are a few different converting programms, some very popular are Calibre and Sigil. But once you checked your html file for validity, you can give Meatgrinder another try.
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