DOCBOOK: Debugging a jade/openjade error message

I have a file which is considered valid for nsgmls and onsgmls but,
with jade or openjade I get this error message:

jade:/home/ldp/SGML/conectiva/../dtds/../style/dsssl/docbook/lib/dblib.dsl:1782:12:E: argument out of range

How can I look for some errors here? What argument is being passed? Is
there a "debug" mode which I can enable at de stylesheet or document
or even at command line so that I have more information?

Thanks!
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