errors in opp log file (xml publisher)

Hi Experts,

   I am getting below error in Opp logs.



    [8/24/12 1:17:55 PM] [36411:RT5389502] Executing post-processing actions for request 5389502.
[8/24/12 1:17:55 PM] [36411:RT5389502] Starting XML Publisher post-processing action.
[8/24/12 1:17:55 PM] [36411:RT5389502]
Template code: IPL_TESTXML
Template app:  IPLCUS
Language:      en
Territory:     00
Output type:   EXCEL
[8/24/12 1:17:55 PM] [UNEXPECTED] [36411:RT5389502] java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:592)
        at oracle.apps.xdo.common.xml.XSLT10gR1.invokeParse(XSLT10gR1.java:566)
        at oracle.apps.xdo.common.xml.XSLT10gR1.transform(XSLT10gR1.java:231)
        at oracle.apps.xdo.common.xml.XSLTWrapper.transform(XSLTWrapper.java:182)