Error on Popover update plugin

Hi there. We are receiving this error when we try to use the pop up plug in. We just upgraded to the new version from 3.1. Currently running the most updated version.

Here is the error:
Fatal error: Call to undefined method stdClass::add_help_tab() in /home/abcdefg/public_html/wp-content/plugins/popover/popoverincludes/classes/ on line 53

Any suggestions? Thanks so much again in advance for your help!