Fatal error: Uncaught Error: Call to undefined function wp_is_block_theme() in /wp-includes/theme-templates.php:214 Stack trace: #0 /wp-includes/class-wp-hook.php(303): wp_enable_block_templates('') #1 /wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(NULL, Array) #2 /wp-includes/plugin.php(470): WP_Hook->do_action(Array) #3 /wp-settings.php(510): do_action('setup_theme') #4 /wp-config.php(76): require_once('/wp-settings.ph...') #5 /wp-load.php(50): 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-includes/theme-templates.php on line 214