Exception -512 Help

Hello,

Im using Xalan for transformation and getting the
following error. what does this mean? and where can I
get the help? when does it come?

javax.xml.transform.TransformerException: -512
        at
org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1226)
        at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:638)
        at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1088)
        at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1066)

Thanks!

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