Ahh, that's strange. We've heard of some issues involving the Overview page throwing different fatal errors, but that's a new one to us.
If you'd like us to investigate some options and test on your server, feel free to PM us a super admin account to your site and we can look into it further. You can PM us by using the arrow under our name to the left and clicking the mail icon. Please do this with the account that you purchased a support subscription to JFBConnect for, as the one you posted above with does not have an active subscription.