ML-Yacc generated code error

Hi,
I'm trying to compile the parser for the straight-line language from the
book "Modern Compiler Implementation in ML" (p.96). ML-Yacc processes the
grammar file without problems, but the generated ML code gives me the
following errors:

slp.grm.sml:164.46-164.49 Error: unbound type constructor: stm
slp.grm.sml:164.21-164.24 Error: unbound type constructor: stm
slp.grm.sml:163.51-163.54 Error: unbound type constructor: exp
slp.grm.sml:163.22-163.25 Error: unbound type constructor: exp
slp.grm.sml:167.15-167.18 Error: unbound type constructor: stm

I would appreciate any help in resolving these errors. The version of SML/NJ
I'm using is 110.68, and I have attached the grammar file below.

http://www.nabble.com/file/p21648997/slp.grm slp.grm 

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