An unregistered event could not be registered as the site is not in learning mode. The event id was: "&1". Session id "&2".
&1 - The event id for the unregistered event.
&2 - The session making the request.
An unregistered event has been received. However, the site is not in learning mode. The event has been rejected and an error message has been shown to the user.
If you want the event to be registered, check the "Automatic event creation" checkbox on the Site Settings page.