Call to a member function containers() on a non-object

PHP Fatal error: Call to a member function containers() on a non-object in /var/www/sites/all/modules/hpcloud/hpcloud.module on line 420

/**
* Get a list of all containers.
*
* @return array
* An associative array of container info.
*/
function _hpcloud_list_containers() {
$store = _hpcloud_object_storage();

return $store->containers();
}

_hpcloud_object_storage(); must not be returning an object.