Hi there, Eric! Thanks forgetting in touch and sorry you’re bumping into some trouble with those error notices.
I wonder if a file was corrupted in the process of updating. Will you please try doing a fresh install of both The Events Calendar (3.9.1) and The Events Calendar PRO (3.9.1)?
You can grab a fresh copy of The Events Calendar here on WordPress and The Events Calendar PRO on this site under My Account > Downloads.
Delete your existing versions, install the new ones, then see if you notice any difference. Please give that a shot and let me know what you find. 🙂
Cheers!
Geoff