The file is there; Eraser will not run without it. But there may be a simpler option.
Right-click on the task in the schedule, and select edit task. In the dialog that opens, change the task type to 'run manually'. Try again. If that doesn't work, exit Eraser as previously described, run Eraser as Administrator, and edit the task again. If that doesn't take, we're back to finding and deleting the task list. To give you an unambiguous path to the file, I'd need to know the Windows version, and the user name from which you are running the program.
David