ICON_LETTER

 ERROR:  You have specified a color to be used in an icon that is not
 in  that icon's color table.  The invalid color is identified in the
 message by displaying  the  letter  used  to  represent  that  color
 between  \  \  .  This letter was not defined in the specified color
 table.

 USER ACTION:  Either add the color to the icon's color table or  use
 a  character  representing  a color in the color table.  The default
 color table defines " " as background and "*" as foreground.