The data contained within the application you are trying to open may have become corrupt. You can delete the stored data by first opening Extras and going into the "Storage" drawer. Next, double-tap on the icon that corresponds with the item you are having a problem with. A dialog box will appear with an option to delete the item. Deleting the item will erase the stored data for that accessory. However, it will not permanently remove the accessory because it is stored in the Newton's read-only-memory (ROM).
This article was published in the 7 May 1997 "Information Alley".