Fatal error: Uncaught Error: Call to undefined function mb_strtoupper() in /usr/local/www/wp/wp-content/plugins/wordpress-seo/src/generators/schema/article.php:225 Stack trace: #0 /usr/local/www/wp/wp-content/plugins/wordpress-seo/src/generators/schema/article.php(59): Yoast\WP\SEO\Generators\Schema\Article->word_count() #1 /usr/local/www/wp/wp-content/plugins/wordpress-seo/src/generators/schema-generator.php(129): Yoast\WP\SEO\Generators\Schema\Article->generate() #2 /usr/local/www/wp/wp-content/plugins/wordpress-seo/src/generators/schema-generator.php(76): Yoast\WP\SEO\Generators\Schema_Generator->generate_graph() #3 /usr/local/www/wp/wp-content/plugins/wordpress-seo/src/presentations/indexable-presentation.php(718): Yoast\WP\SEO\Generators\Schema_Generator->generate() #4 /usr/local/www/wp/wp-content/plugins/wordpress-seo/src/presentations/abstract-presentation.php(66): Yoast\WP\SEO\Presentations\Indexable_Presentation->generate_schema() #5 /usr/local/www/wp/wp-content/plugins/wordpress-seo/src/presenters/schema-present in /usr/local/www/wp/wp-content/plugins/wordpress-seo/src/generators/schema/article.php on line 225
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