Quote:
Originally Posted by PKTC
I want to make my books available through Ingram Spark. They require EPUB 3 (not 3 enhanced). I converted a trial book to EPUB in Calibre (latest version) and tested it with the validator specified by Ingram Spark. The list of errors was enormous. Can anyone help me with this, please?
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As Calibre doesn't support ePUB3, I am not surprised. Like Doitsu said, download Sigil with the ePUB3 output plugin.
Since you don't specify the source format, can you please tell us? Somehow I suspect that you don't have and ePUB2 yet and are trying to convert to an ePUB from another source. Be aware that the outcome of such conversions can vary from bad to good, all depending on the source.