THE KEY CODE DOES NOT EXIST.
SEE THE STYLE SHEET FOR VALID KEY CODES.
 
The key code you typed is not listed on the style
sheet attached to your document.
 
■ Try pressing the keys again, making sure you
  type the key code correctly.
■ If the message appears again, check the
  attached style sheet by choosing Format Define
  Styles. If the style you are looking for is not
  listed, look for it on a different style sheet.
■ To open another style sheet, choose File Open.