Calendar Pop Up Showing Up Blank

Hi!

I downloaded this calendar and put it in the footer of my site as a widget. I added events and on the page it shows that there is an event on the calendar with the line under the number of the day that has an event. However, when you click on that day to see the event, the pop up is just a blank box that doesn’t have anything in it. If you would like to see what the problem is, the site is https://honors01.usu.edu.

Thanks for your help!

Sara

https://www.ads-software.com/plugins/spider-event-calendar/