[plt-scheme] Essentials of Prog. Lang. 6-grammar.scm bad scanner

The 6-grammar.scm in

http://www.cs.indiana.edu/eopl/code.tar

when opened (from File menu in DrScheme 4.0)
and then Run, produces the error:
{--- cut here ---

Welcome to DrScheme, version 4.0.0.1-svn16jun2008 [3m].
Language: Essentials of Programming Languages (2nd ed.).
grammar.scm: 2000-12-15 15:18
. sllgen:make-define-datatypes: bad scanner specification in: 
the-lexical-spec
 >

}--- cut here ---

in the interactions window.  The language was
Essentials of Programming Languages(2nd Ed.)

Is this just error due to incompatibility between an old plt-scheme
and the 4.0 plt-scheme? IOW, should I just let the book authors know
about the error?