When i try to run a example,throw exception

Hi all,

***************** JRexL inited *****************
***************** JREX-Logging disabled *****************
"InitXPCOMInternal()--> **** XPCOMGlueStartup" Failed!!! ****
Exception in thread "main" org.mozilla.jrex.exception.JRexException
     at org.mozilla.jrex.xpcom.JRexXPCOMImpl.startXPCOM(
JRexXPCOMImpl.java:143)
     at org.mozilla.jrex.JRexFactory.startEngine(JRexFactory.java:222)
     at com.JRexExample.main(JRexExample.java:35)
Caused by: org.mozilla.jrex.exception.JRexException: initXPCOM()
-->Intialization of XPCOM failed [NS-ERROR<0x-2147467259L>]
     at org.mozilla.jrex.xpcom.JRexXPCOMImpl.InitXPCOM(Native Method)
     at org.mozilla.jrex.xpcom.JRexXPCOMImpl.access$200(
JRexXPCOMImpl.java:45)
     at org.mozilla.jrex.xpcom.JRexXPCOMImpl$1.run(JRexXPCOMImpl.java:173)


why?

thanks.