When I began installing SimAnswers which looks like a great extension for my site I get the following .... community_userpoints' doesn't exist

the whole message is .... community_userpoints' doesn't exist SQL=SELECT count(`id` ) as `count` FROM `__community_userpoints` WHERE `action_string` = 'com_simanswers.participation'

Don't need you to dig around my database for me, sure I can manage on my own.

Have you seen this error before? Thanks