XF 2.1 Class XF\Service\UserGroupChange does not exist

[Wutime]

I'm trying to implement UserGroupChange in my Entity class as follows

$userGroupChange = \XF::service('XF:UserGroupChange'); $userGroupChange->addUserGroupChange($this->user_id, 'my_key', $role_id);

and getting the error:

Class XF\Service\UserGroupChange does not exist

I've tried including both, or either of (to no avail):

use XF\Service\User; use XF\Service\User\UserGroupChange;

Any idea what I'm missing? Thanks in advance

 

[Wutime]

\XF::service('XF:User\UserGroupChange');

is correct, doh