Fatal error: Uncaught Error: Call to undefined function mb_strtoupper() in /var/www/vhosts/v-3595.webspace/kazadi.edu.kz/wp-content/plugins/wordpress-seo/src/generators/schema/article.php:226 Stack trace: #0 /var/www/vhosts/v-3595.webspace/kazadi.edu.kz/wp-content/plugins/wordpress-seo/src/generators/schema/article.php(60): Yoast\WP\SEO\Generators\Schema\Article->word_count('\xD0\x9B\xD0\xBE\xD0\xB2\xD0\xB8 \xD0\xA3\xD0\xB4\xD0\xB0...', '\xD0\x9B\xD0\xBE\xD0\xB2\xD0\xB8 \xD0\xA3\xD0\xB4\xD0\xB0...') #1 /var/www/vhosts/v-3595.webspace/kazadi.edu.kz/wp-content/plugins/wordpress-seo/src/generators/schema-generator.php(129): Yoast\WP\SEO\Generators\Schema\Article->generate() #2 /var/www/vhosts/v-3595.webspace/kazadi.edu.kz/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 /var/www/vhosts/v-3595.webspace/kazadi.edu.kz/wp-content/plugins/wordpress-seo/src/presentations/indexable-presentation in /var/www/vhosts/v-3595.webspace/kazadi.edu.kz/wp-content/plugins/wordpress-seo/src/generators/schema/article.php on line 226