HTML 5 validation output error

Hey guys, I run my website on https://validator.w3.org, for example cara menghilangkan jerawat. Unfortunately this plugin return errors, :

Line 78, Column 169: Attribute xmlns:v not allowed here.
…s:v="https://rdf.data-vocabulary.org/#"><p><span class="breadcrumbs-title"> </s…

Anyone have a way to fix it?

https://www.ads-software.com/extend/plugins/rdfa-breadcrumb/