NUMBER:  19

  ERROR CODE:  F

  MESSAGE TEXT:  invalid reference to variable in NAMELIST input

  EXPLANATION:  The variable in error is shown as "varname" in the
  message text.  One of the following conditions occurred:

   o  The variable was not a member of the namelist group.

   o  An attempt was made to subscript a scalar variable.

   o  A subscript of the array variable was out-of-bounds.

   o  An array variable was specified with too many or too few
      subscripts for the variable.

   o  An attempt was made to specify a substring of a noncharacter
      variable or array name.

   o  A substring specifier of the character variable was
      out-of-bounds.

   o  A subscript or substring specifier of the variable was not an
      integer constant.

   o  An attempt was made to specify a substring using an
      unsubscripted array variable.