Fatal error: Uncaught Error: Interface "Zend_Feed_Pubsubhubbub_CallbackInterface" not found in C:\SHC\xampp\htdocs\shc_mobile_backend\vendor\diablomedia\zendframework1\library\Zend\Feed\Pubsubhubbub\CallbackAbstract.php:30 Stack trace: #0 {main} thrown in C:\SHC\xampp\htdocs\shc_mobile_backend\vendor\diablomedia\zendframework1\library\Zend\Feed\Pubsubhubbub\CallbackAbstract.php on line 30