With the following task, if lines three to five are not deactivated, then the error shown below will pop up when the tasker editor is started, if you edit the task. That is, just open up the task, don't change it, close it, close the tasker editor, open the tasker editor and the error dialogue shown will pop up. There is no need to run the task to get the error message. Lines three to five actualy work fine, you just get an error message every time you edit the task.
Fortunately I have discovered a work around which is