[Lizard]

You can fix the script by opening it in Script Editor, and changing the two places where "<<class Otco>>" occurs to "completed".

However, this script was mostly created as a temporary workaround until 1.5 was released. Now you can accomplish essentially the same thing just by dragging tasks from one project to another. (In 1.1, that would only copy the tasks, but now it also brings their resource assignments.)