DOCBOOK: xt and newwest XML stylesheets HOW?

Hi,

If i do the following, i get the following error.
With version 1.56 everything was oke, but the newwest docbook XML
stylesheets give me this problem.
It does not matter which test i take, same error

C:\TOOLS\docbookxml\docbook\test>xt article.XML ../html/chunk.xsl >
aap.html
file:/C:/TOOLS/docbookxml/docbook/html/index.xsl:273: no such function:
key

Thanks for any help,

Klaas Holwerda