INVREFVAR

 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.