unable to get transformer handler

[fa...@virgilio.it]

this seems a normal error:

An Error Occurredorg.apache.cocoon.ProcessingExceptionUnable to get transformer
handler for file:/cocoon-2.1.5/build/webapp/fabpicca/navigator/application/login/authenticate.xslorg.apache.cocoon.ProcessingException:
Unable to get transformer handler for file:/cocoon-2.1.5/build/webapp/fabpicca/navigator/application/login/authenticate.xsl:
org.apache.excalibur.xml.xslt.XSLTProcessorException: Exception in creating
Transform Handlerjava.lang.RuntimeException: Programmer's assertion in getNextStepPos:
unknown stepType: -1

but i cannot understand the reason why cocoon can't get the requested handler.
in particular i cannot understand this:
Programmer's assertion in getNextStepPos: unknown stepType: -1


some help?

thanks
-fp


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