problem with plugin when enabled

mobile site wont Load due to Fatal error
call to undefined function has_calendar_event() in /homepages/20/d347976035/htdeocs/wp-content/plugins/widget-logic/widget_logic.php(286):eval()’d code on line 1
if I disable w3total cache the mobile site works (but my widget areas disappear a different problem even with nothing switched on)

https://wordpress.org/plugins/w3-total-cache/