Hello,
That means you are using a recent free version, with an old version of the module iC Event List (before iCagenda 3.4.0)
So, if you have still a valid pro subscription, please update the Pro version.
If no valid pro subscription, contact me by email, and i will send you an old version of module iC Event list, but with a little fix to work with new free version. (but better to keep a pro version when using iC Event List module
)
When contact, use email address used during Pro purchase on Share-it, for your message not to be discarder by my inbox filtering
Regards,
Cyril