WP_List_Util’ not found

Hi,

I just installed the andpress plugin and the moment I click to do anything I get this error “Fatal error: Class ‘WP_List_Util’ not found in C:xampphtdocswordpresswp-contentpluginsanspress-question-answerincludesfunctions.php on line 633”.

I am not able to do anything, please suggest what to do.

Best regards.