Fatal error: Uncaught Error: Interface 'Zend_Feed_Pubsubhubbub_CallbackInterface' not found in C:\MANTUM\xampp2\htdocs\MNT\ventasvariables2\libreria\Zend\Feed\Pubsubhubbub\CallbackAbstract.php:40
Stack trace:
#0 {main}
  thrown in C:\MANTUM\xampp2\htdocs\MNT\ventasvariables2\libreria\Zend\Feed\Pubsubhubbub\CallbackAbstract.php on line 40