FOP embed

[Xie, David (IPCG-NJ)]

Hi all,

I am trying to generate PDF straight from xml and xsl using embedding FOP.  
However, I am experiencing the following error?  Does anyone know what cause 
the "unknown formatting object ^html error"?  I
appreciate your help.

Error message: 

building formatting object tree
setting up fonts
WARNING: Unknown formatting object ^html
org.apache.fop.apps.FOPException
        at org.apache.fop.apps.Driver.render(Driver.java:429)
        at org.apache.fop.apps.Driver.run(Driver.java:508)
        at org.apache.fop.tools.servlet.FopPdf.renderFO(FopPdf.java:199)
        at org.apache.fop.tools.servlet.FopPdf.renderXml_Xsl(FopPdf.java:224)
        at org.apache.fop.tools.servlet.FopPdf.doGet(FopPdf.java:156)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.catalina.servlets.InvokerServlet.serveRequest(Unknown Sour
ce)
        at org.apache.catalina.servlets.InvokerServlet.doGet(Unknown Source)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Unkn
own Source)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(Unknown Sour
ce)