You are trying to view the first, previous, next, or last slide, but you have no current slide. [Note: I'm not entirely sure under what circumstances the user could get this error. Perhaps if they deleted all the slides out of their slide show file.] If your current slide show file is empty, or you haven't opened a slide show file, select the Open button or the File | Open menu item to open a slide show file. If your current slide show file is not empty, you may view the First or Last slide by selecting the corresponding toolbar buttons or Slide menu items.