Fatal error: Uncaught Error: Call to undefined function wp_is_block_theme() in /wp-content/plugins/schema-and-structured-data-for-wp/admin_section/common-function.php:5466 Stack trace: #0 /wp-content/plugins/schema-and-structured-data-for-wp/modules/reviews/class-saswp-review-feature-frontend.php(54): saswp_is_block_theme() #1 /wp-content/plugins/schema-and-structured-data-for-wp/modules/reviews/class-saswp-review-feature-frontend.php(1756): SASWP_Review_Feature_Frontend->__construct() #2 /wp-content/plugins/schema-and-structured-data-for-wp/structured-data-for-wp.php(109): require_once('/wp-content/plu...') #3 /wp-settings.php(377): include_once('/wp-content/plu...') #4 /wp-config.php(82): require_once('/wp-settings.ph...') #5 /wp-load.php(37): require_once('/wp-config.php') #6 /wp-blog-header.php(13): require_once('/wp-load.php') #7 /index.php(17): require('/wp-blog-header...') #8 {main} thrown in /wp-content/plugins/schema-and-structured-data-for-wp/admin_section/common-function.php on line 5466