Can't create calendar

Hm – this doesn’t seem to go anywhere.
– I can’t create a calendar. I cretae, populate all the fields, press OK – and no calendar is created.
– I can create events (not sure where they are going, but they are created and listed. But when using the shortcode
[dpProEventCalendar ….
all I get is
Warning: array_walk() [function.array-walk]: The argument should be an array in /—-/wp-content/plugins/lite-event-calendar/includes/core.php on line 80

https://www.ads-software.com/plugins/lite-event-calendar/