Fatal Error

Hi I am getting this error on activation:

Plugin could not be activated because it triggered a fatal error.

Fatal error: Class WPBakeryShortCode_Twenty20_Shortcode contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (WPBakeryShortCode::content) in /srv/users/serverpilot/apps/magnoliadds/public/wp-content/plugins/twenty20/inc/twenty20-shortcode-vc.php on line 98

Thanks!