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Main page blocked #639
After installing the plugin, I've tried to fill all the plugin sections on my main page.
When filling the "Main keyword" and refresh the page I'v get this message:
"Call to undefined function has_post_thumbnail() in /home/kuzudecole/domains/kuzudecoletaje.es/public_html/wp-content/plugins/wordpress-seo/admin/class-metabox.php on line 1213"
After that I can`t edit this page.
¿What can I do?