How I can resolve the hreflang tag error?
International Targeting | Language > 'es-es' - no return tags
URLs for your site and alternate URLs in 'es-es' that do not have return tags.
5 Hreflang Tags with Errors
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Mar 23, 2016
you need to have a 1-1 relationship between your pages and have return tags.
Example:
www.domain.com/page-a-in-english
canonical to the ENGLISH page, alternate language ES-ES, and EN-US
www.domain.es/page-a-in-SPANISH
canonical to the SPANISH page, alternate language ES-ES, and EN-US
so that Google will see that both "page-a-in-SPANISH" AND "/page-a-in-english" refer to each other
hope this helps you, good luck with that
I have added below code in the website header.