Whenever I want to set up a new To-Do in the To-Do List and I click on apply I get the following notification:
personal calendar: calendar not loaded
I regularly get notification of newly added to-do's, that is KOrganizer Reminder Daemon is correctly running and reminding me of to-do's I've added, so I don't understand what am I doing wrong.

Is there anyway to load such calendar and prevent this notification to be popped up every time? Many thanks in advance!