Validating Meta itemprop attribute

Hi everyone,
We are working on improving the schema and code of a real estate website
www.mlsvallarta.com
We are trying to validate all our metas, we are including them in the HTML
like this:
<meta itemprop="url" content="
https://www.mlsvallarta.com/news/punta-mita-has-another-great-year/" />
But the w3 validator is displaying the following error.
Error: The itemprop attribute was specified, but the element is not a
property of any item.
Does someone knows if this is the correct way to include a non JSON schema
or how can we validate our current way to include schema?
Thanks in advance.

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