Fatal error: Uncaught Error: Call to undefined function wp_theme_has_theme_json() in /home/customer/www/coolandcool.pk/public_html/wp-includes/theme-templates.php:212 Stack trace: #0 /home/customer/www/coolandcool.pk/public_html/wp-includes/class-wp-hook.php(308): wp_enable_block_templates('') #1 /home/customer/www/coolandcool.pk/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array) #2 /home/customer/www/coolandcool.pk/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #3 /home/customer/www/coolandcool.pk/public_html/wp-settings.php(555): do_action('setup_theme') #4 /home/customer/www/coolandcool.pk/public_html/wp-config.php(93): require_once('/home/customer/...') #5 /home/customer/www/coolandcool.pk/public_html/wp-load.php(50): require_once('/home/customer/...') #6 /home/customer/www/coolandcool.pk/public_html/wp-blog-header.php(13): require_once('/home/customer/...') #7 /home/customer/www/coolandcool.pk/public_html/index.php(17): require('/home/customer/...') #8 {main} thr in /home/customer/www/coolandcool.pk/public_html/wp-includes/theme-templates.php on line 212