I use the Freshy theme. As soon as activated the option for the opengraph on the SEO plugin, I got:
Fatal error: Call to undefined function has_post_thumbnail() in /home/……/site/wp-content/plugins/wordpress-seo/frontend/class-opengraph.php on line 138
Furthermore on the XML sitemap matter. I allready use the Google XML-sitemaps plugin. Must I deactivate it if I am to check the “XML sitemap” on SEO?
Excellent work (as always). Thanx in advance
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