Yes, I did change the template, and I still got the error.
I upgraded the Events Cal Plugin and then got an error that said I was having a mismatch on the backend, and the fatal error on the front end. Came to the tribe, grabbed 3.1 of the EC Pro and uploaded that… the error did not go away.
Because my site is production, I am in the process of rolling back to 3.0.3 because I need my charity site up and working :/