Fatal error: Uncaught Error: Call to undefined function mb_strtoupper() in /usr/local/www/wordpress/wp-content/plugins/wordpress-seo/src/generators/schema/article.php:226 Stack trace: #0 /usr/local/www/wordpress/wp-content/plugins/wordpress-seo/src/generators/schema/article.php(60): Yoast\WP\SEO\Generators\Schema\Article->word_count('\xD0\xA7\xD0\xBB\xD0\xB5\xD0\xBD\xD1\x81\xD1\x82\xD0\xB2\xD0...', '\xD0\xA7\xD0\xBB\xD0\xB5\xD0\xBD\xD1\x81\xD1\x82\xD0\xB2\xD0...') #1 /usr/local/www/wordpress/wp-content/plugins/wordpress-seo/src/generators/schema-generator.php(129): Yoast\WP\SEO\Generators\Schema\Article->generate() #2 /usr/local/www/wordpress/wp-content/plugins/wordpress-seo/src/generators/schema-generator.php(76): Yoast\WP\SEO\Generators\Schema_Generator->generate_graph(Array, Object(Yoast\WP\SEO\Context\Meta_Tags_Context)) #3 /usr/local/www/wordpress/wp-content/plugins/wordpress-seo/src/presentations/indexable-presentation.php(718): Yoast\WP\SEO\Generators\Schema_Generator->generate(Object(Yoast\WP\SEO\Context\Meta_Tags_Context)) #4 /usr/local/www/wordpress/wp-content/plugins/wordpress-seo/src/presentations/abstract-presentation.php(66): Yoast\WP\SEO\Presentations\Indexable_Presentation->generate_schema() #5 /usr/local/www/wordpress/wp-content/plugins/wordpress-seo/src/presenters/schema-presenter.php(60): Yoast\WP\SEO\Presentations\Abstract_Presentation->__get('schema') #6 /usr/local/www/wordpress/wp-content/plugins/wordpress-seo/src/presenters/schema-presenter.php(44): Yoast\WP\SEO\Presenters\Schema_Presenter->get() #7 /usr/local/www/wordpress/wp-content/plugins/wordpress-seo/src/integrations/front-end-integration.php(409): Yoast\WP\SEO\Presenters\Schema_Presenter->present() #8 /usr/local/www/wordpress/wp-includes/class-wp-hook.php(308): Yoast\WP\SEO\Integrations\Front_End_Integration->present_head('') #9 /usr/local/www/wordpress/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array) #10 /usr/local/www/wordpress/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #11 /usr/local/www/wordpress/wp-content/plugins/wordpress-seo/src/integrations/front-end-integration.php(383): do_action('wpseo_head') #12 /usr/local/www/wordpress/wp-includes/class-wp-hook.php(308): Yoast\WP\SEO\Integrations\Front_End_Integration->call_wpseo_head('') #13 /usr/local/www/wordpress/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array) #14 /usr/local/www/wordpress/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #15 /usr/local/www/wordpress/wp-includes/general-template.php(3049): do_action('wp_head') #16 /usr/local/www/wordpress/wp-content/themes/Avada/header.php(21): wp_head() #17 /usr/local/www/wordpress/wp-includes/template.php(783): require_once('/usr/local/www/...') #18 /usr/local/www/wordpress/wp-includes/template.php(718): load_template('/usr/local/www/...', true, Array) #19 /usr/local/www/wordpress/wp-includes/general-template.php(48): locate_template(Array, true, true, Array) #20 /usr/local/www/wordpress/wp-content/themes/Avada/single.php(15): get_header() #21 /usr/local/www/wordpress/wp-includes/template-loader.php(106): include('/usr/local/www/...') #22 /usr/local/www/wordpress/wp-blog-header.php(19): require_once('/usr/local/www/...') #23 /usr/local/www/wordpress/index.php(17): require('/usr/local/www/...') #24 {main} thrown in /usr/local/www/wordpress/wp-content/plugins/wordpress-seo/src/generators/schema/article.php on line 226
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