DOCBOOK-APPS: Problems with Slides3 and saxon

I have tried to use Slides3.0b2 and saxon and get the error 
Error at xsl:variable on line 67 of file:/vol/lab/share/sgml/stylesheets/docbook-xsl-1.56.1/html/chunk.xsl:
  Error in expression ($div/preceding-sibling::div|$div/preceding::div|$div/parent::div)[last()]: expected "<name>", found "div"

with the same error at line 71 of the file

I've run the command on the minimal test file provded with Slides:
 java -classpath /homes/iwm/src/saxon/saxon.jar com.icl.saxon.StyleSheet -o out1.html minimal.xml file:///homes/iwm/src/slides-3.0b2/xsl/plain.xsl

There is no problem producing html from a docbook file using the same version of the stylesheet and saxon

     Ian Moor
Ian W Moor  Room 326,  Department of Computing,
           Imperial College.
Tel +44 20 7594 8250 180 Queensgate
                                     London SW7 2BZ UK.