Fatal error: Uncaught Error: Call to undefined function wp_theme_has_theme_json() in /homepages/20/d4296821001/htdocs/wordpress/wp-includes/theme-templates.php:212 Stack trace: #0 /homepages/20/d4296821001/htdocs/wordpress/wp-includes/class-wp-hook.php(308): wp_enable_block_templates('') #1 /homepages/20/d4296821001/htdocs/wordpress/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array) #2 /homepages/20/d4296821001/htdocs/wordpress/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #3 /homepages/20/d4296821001/htdocs/wordpress/wp-settings.php(555): do_action('setup_theme') #4 /homepages/20/d4296821001/htdocs/wordpress/wp-config.php(189): require_once('/homepages/20/d...') #5 /homepages/20/d4296821001/htdocs/wordpress/wp-load.php(50): require_once('/homepages/20/d...') #6 /homepages/20/d4296821001/htdocs/wordpress/wp-blog-header.php(13): require_once('/homepages/20/d...') #7 /homepages/20/d4296821001/htdocs/wordpress/index.php(17): require('/homepages/20/d...') #8 {main} thrown in /homepages/20/d4296821001/htdocs/wordpress/wp-includes/theme-templates.php on line 212