One day I was trying to edit a todo event and got "Unable to edit item: it is locked by another process." error message. I've renamed .kde/share/apps/korganizer folder and restarted kontact, after that I've got empty todo as expected, but I couldn't create any todo, getting "There is no resource available." error. When I restored the renamed folder I have empty todo list and still can't add new todos. Any ideas how can I get my editable todo list back?