Askimet plug-in Problem

I recently updated my plugins, and once i did i got the following error:
Fatal error: Cannot redeclare class Akismet in /hermes/bosweb25c/b2556/sl.dentonca/public_html/wp-content/themes/puremagazine/lib_frame/classes/akismet.php on line 353

i can’t do anything. it’s all i can see if i try to click anywhere. even if i go outside the Admin side and simply look at the website itself.