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Fatal error after plugin activation (1 post)

  1. JeffreyPia
    Member
    Posted 2 years ago #

    Upon plugin activation, the site front-end returns the following error:
    Fatal error: Call to undefined method WP_Query::is_main_query() in /wp-content/plugins/wordpress-seo/frontend/class-frontend.php on line 431

    http://wordpress.org/extend/plugins/wordpress-seo/

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