Fatal error: Cannot assign by reference to overloaded object in /home/itcoordinator1/public_html/components/com_jevents/jevents.php on line 90

I am new to Joomla - recently upgraded it. No backup. Now I see this error when attempting to load the calendar. Appreciate any help. I will need spoon fed info, please don't assume that I have any knowledge of Joomla or extensions.
Thanks,