VMS Help FORTRAN, Error Messages, Compilation Errors, DIRSTRREQ  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  SEVERITY:  I

  MESSAGE TEXT:  Directive requires string constant, directive
  ignored

  EXPLANATION:  This error only occurs with the use of the CDEC$
  compiler directive statements:  TITLE, SUBTITLE, and IDENT.

  String values for the TITLE, SUBTITLE, and IDENT directives cannot
  be more than 31 characters.  Any other values, including PARAMETER
  statement constants that are defined to be strings, are invalid on
  these directives.