Thanks lordgiotto. But I found it difficult to reach functions.php. So to add boost to this help am giving discription how to reach functions.php.
https://www.yourdomainname.com//wp-admin/theme-editor.php later you can click on functions.php and add add_filter(‘deprecated_constructor_trigger_error’, ‘__return_false’); line any where. my hello godavari and recipes duniya websites recovered from the same issue.