Fatal error : Uncaught Error: Call to undefined function mb_strtoupper()/var/www/html/wordpress/wp-content/plugins/wordpress-seo/src/generators/schema/article.php on line 226
Call stack:
Yoast\W\S\G\S\Article::word_count()wp-content/plugins/wordpress-seo/src/generators/schema/article.php:60 Yoast\W\S\G\S\Article::generate()wp-content/plugins/wordpress-seo/src/generators/schema-generator.php:129 Yoast\W\S\G\Schema_Generator::generate_graph()wp-content/plugins/wordpress-seo/src/generators/schema-generator.php:76 Yoast\W\S\G\Schema_Generator::generate()wp-content/plugins/wordpress-seo/src/presentations/indexable-presentation.php:718 Yoast\W\S\P\Indexable_Presentation::generate_schema()wp-content/plugins/wordpress-seo/src/presentations/abstract-presentation.php:66 Yoast\W\S\P\Abstract_Presentation::__get()wp-content/plugins/wordpress-seo/src/presenters/schema-presenter.php:60 Yoast\W\S\P\Schema_Presenter::get()wp-content/plugins/wordpress-seo/src/presenters/schema-presenter.php:44 Yoast\W\S\P\Schema_Presenter::present()wp-content/plugins/wordpress-seo/src/integrations/front-end-integration.php:326 Yoast\W\S\I\Front_End_Integration::present_head()wp-includes/class-wp-hook.php:310 WP_Hook::apply_filters()wp-includes/class-wp-hook.php:334 WP_Hook::do_action()wp-includes/plugin.php:517 do_action()wp-content/plugins/wordpress-seo/src/integrations/front-end-integration.php:300 Yoast\W\S\I\Front_End_Integration::call_wpseo_head()wp-includes/class-wp-hook.php:310 WP_Hook::apply_filters()wp-includes/class-wp-hook.php:334 WP_Hook::do_action()wp-includes/plugin.php:517 do_action()wp-includes/general-template.php:3053 wp_head()wp-content/themes/prague-morning/header.php:8 require_once()wp-includes/template.php:785 load_template()wp-includes/template.php:720 locate_template()wp-includes/general-template.php:48 get_header()wp-content/themes/prague-morning/single-post.php:1 include()wp-includes/template-loader.php:106 require_once()wp-blog-header.php:19 require()index.php:17