Fatal error: Bad class name in the catch statement in D:\xampp\htdocs\sa\wp-includes\functions.php on line 4387

Fatal error: Uncaught Error: Call to undefined function wp_is_serving_rest_request() in D:\xampp\htdocs\sa\wp-includes\functions.php:3789 Stack trace: #0 D:\xampp\htdocs\sa\wp-includes\class-wp-fatal-error-handler.php(245): wp_die(Object(WP_Error), '', Array) #1 D:\xampp\htdocs\sa\wp-includes\class-wp-fatal-error-handler.php(156): WP_Fatal_Error_Handler->display_default_error_template(Array, false) #2 D:\xampp\htdocs\sa\wp-includes\class-wp-fatal-error-handler.php(60): WP_Fatal_Error_Handler->display_error_template(Array, false) #3 [internal function]: WP_Fatal_Error_Handler->handle() #4 {main} thrown in D:\xampp\htdocs\sa\wp-includes\functions.php on line 3789