ERROR:  The object pointed  to  in  the  message  was  either  never
  defined  or  not  defined  prior  to  this point in the module.  The
  compiler requires the object to be defined before you refer  to  the
  object.

  USER ACTION:  Check for  a  misspelling  of  the  object's  name,  a
  missing  declaration  for  the object, or declaring the object after
  its first reference.  If names in the module are case-sensitive, the
  spellings  of  the name in the declaration and in the reference must
  match exactly.