weekly view tab error

I just purchased, downloaded and installed the calendar template, and I'm still feeling my way around and figuring out what it can do.
One thing doesn't appear to be working correctly, however. After creating the tables and building the project and uploading it, when I click on the "Weekly" view tab - which links to:
... /weekly_list.php
I get
Fatal error: Call to undefined function sunstr() in /home/.sites/28/site1/web/beadfxAdmin/calendar1/include/weekly_events.php on line 260
this happens for both the "guest" and the "admin" user
I didn't see this listed on any of the forum questions. Is there a fix for this?
Thanks!