Fatal error: Uncaught Error: Call to undefined function wp_theme_has_theme_json() in /home/customer/www/ahsanpublication.com/public_html/wp-content/plugins/cartflows/modules/gutenberg/classes/class-cartflows-init-blocks.php:78 Stack trace: #0 /home/customer/www/ahsanpublication.com/public_html/wp-content/plugins/cartflows/modules/gutenberg/classes/class-cartflows-init-blocks.php(42): Cartflows_Init_Blocks->__construct() #1 /home/customer/www/ahsanpublication.com/public_html/wp-content/plugins/cartflows/modules/gutenberg/classes/class-cartflows-init-blocks.php(587): Cartflows_Init_Blocks::get_instance() #2 /home/customer/www/ahsanpublication.com/public_html/wp-content/plugins/cartflows/modules/gutenberg/classes/class-cartflows-block-loader.php(64): require_once('/home/customer/...') #3 /home/customer/www/ahsanpublication.com/public_html/wp-content/plugins/cartflows/modules/gutenberg/classes/class-cartflows-block-loader.php(44): Cartflows_Block_Loader->load_plugin() #4 /home/customer/www/ahsanpublication.com/public_html/wp- in /home/customer/www/ahsanpublication.com/public_html/wp-content/plugins/cartflows/modules/gutenberg/classes/class-cartflows-init-blocks.php on line 78