Xalan servlet sample problem

[marco giannetti]

hi,   I  downloaded a Xalan library 2.5.1 and I tryied to run a sample,   I placed the file xalanserlvet.war into tomcat 4.0.6       but when i call the servlet  http://localhost:8080/xalanservlet/SimpleXSLTServlet   it return a message error like :     The output format must have a '{http://xml.apache.org/xslt}content-handler' property!org.apache.xml.utils.WrappedRuntimeException: The output format must have a '{http://xml.apache.org/xslt} content-handler' property! at org.apache.xalan.serialize.SerializerFactory.getSerializer(SerializerFactory.java:142) at org.apache.xalan.transformer.TransformerImpl.createResultContentHandler(TransformerImpl.java:1007) at ........     why where is the problem ??   I have mistaken  same configuration ???       thanks marco