libvirt users - Aug 2012 - libvir: Domain Config error : internal error incorrect root element

hi,    When I use dom = virDomainDefineXML(conn, xml) to define xml, I countered
a problem that " libvir: Domain Config error : internal error incorrect
root element". Could you please tell me what's wrong with it?    I tend
to debug such problem above by gdb to step into virDomainDefineXML. When I press
"step" in gdb, the console just shows the wrong messages, so I fail to
access to the internal function of virDomainDefineXML.     My libvirt's
version is 0.98 allowing debug with the command "CFLAGS = -g -O2" in
libvirt's Makefile. I installed libvirt-bin by "sudo apt-get install
libvirt-bin"in ubuntu. Is there something wrong in my installing steps?
    Thanks a lot! 
    Best Regards,    Corey 		 	   		  
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