500 Servlet Exception

java.io.CharConversionException: stream:41: illegal utf8 encoding at 0xe9
0x66 0x69
	at com.caucho.xml.readers.Utf8Reader.error(Utf8Reader.java:175)
	at com.caucho.xml.readers.Utf8Reader.readSecond(Utf8Reader.java:127)
	at com.caucho.xml.readers.Utf8Reader.read(Utf8Reader.java:105)
	at com.caucho.xml.XmlParser.parseNode(XmlParser.java:309)
	at com.caucho.xml.XmlParser.parseInt(XmlParser.java:242)
	at com.caucho.xml.AbstractParser.parse(AbstractParser.java:628)
	at com.caucho.xml.AbstractParser.parseDocument(AbstractParser.java:792)
	at com.caucho.xml.AbstractParser.parseDocument(AbstractParser.java:765)
	at com.caucho.jsp.XslFilter.service(XslFilter.java:151)
	at com.caucho.server.http.FilterChainServlet.doFilter(FilterChainServlet.java:96)
	at com.caucho.server.http.QNamedDispatcher.forward(QNamedDispatcher.java:157)
	at com.caucho.server.http.QNamedDispatcher.chain(QNamedDispatcher.java:86)
	at com.caucho.server.http.FilterChainBase.handleChain(FilterChainBase.java:93)
	at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:185)
	at com.caucho.server.http.Invocation.service(Invocation.java:311)
	at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
	at com.caucho.server.http.RunnerRequest.handleRequest(RunnerRequest.java:342)
	at com.caucho.server.http.RunnerRequest.handleConnection(RunnerRequest.java:272)
	at com.caucho.server.TcpConnection.run(TcpConnection.java:137)
	at java.lang.Thread.run(Thread.java:484)

Resin 2.1.1 (built Mon May 13 16:53:21 PDT 2002)