ERROR:  Certain UIL objects such  as  gadgets  and  widgets  can  be
  referred  to  before they are defined.  The marked object is such an
  object, however, the compiler never found the object's declaration.

  USER  ACTION:   Check   for   misspelling.    If   the   module   is
  case-sensitive,  the  spellings  of  names  in  declarations  and in
  references must match exactly.