You should find a <metadata ....> section closed by a </metadata>, a <manifest> closed by a </manifest> and a <spine> closed by a </spine>. This error may indicate that either the <spine> is missing or there is more than 1 <spine>.
If you can post the entire content.opf, it would be easier to see what is wrong. You can rename to to .txt and attach it or copy/paste the content (preferably inside [spoiler][code] . . . . [/code][/spoiler].
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