When I try to open an epub file built with sigil on kindle previewer, it says it's failed to compile it and "Error(opfparser):E20006: There are more than one title defined in OPF metadata. But none of them is refined with "title-type" as "main" title. Refer
http://idpf.org/epub/30/spec/epub30-...ec-opf-dctitle for more info."
I follow the steps given at this link and insert "<meta property="title-type" refines="title">main</meta>" after the title.
The validation results say "property" and "refines" aren't allowed attributes of the <meta> element and that "content" and "name" are missing from it.
How do I get round this? I'm using Sigil 0.7.1.
Kate