problem with ops 3.6 portley

Hi all,
 
I developed sample portlet with button.When i click on button it shows error like this:
call stack:

Resource URL	Line	Column	Description	XML Element
oxf:/config/xforms-widgets.xsl	27	N/A	processing submission dispatching XForms event event → xxforms-submit target id → _Callisto_WAR_orbeon_submit-submission	<xforms:submission id="_Callisto_WAR_orbeon_submit-submission" class="fr-service" ref="instance('fr-form-instance')" action="/Callisto/show" method=" ;post"/>
oxf:/ops/xforms/xforms-server-submit.xpl	61	43	executing processor name → {<a href="http://www.orbeon.com/oxf/processors}xforms-server">http://www.orbeon.com/oxf/processors}xforms-server	<p:processor name="oxf:xforms-server">...</p:processor>

on console it shows:

SEVERE: Servlet.service() for servlet Callisto threw exception
java.lang.NullPointerException
        at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServl
et.java:74)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDisp
atcher.java:672)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(Applica
tionDispatcher.java:463)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationD
ispatcher.java:398)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDis
patcher.java:301)
        at org.orbeon.oxf.externalcontext.ServletToExternalContextRequestDispatc
herWrapper.forward(ServletToExternalContextRequestDispatcherWrapper.java:35)
        at org.orbeon.oxf.xforms.XFormsSubmissionUtils.doOptimized

(XFormsSubmissionUtils.java:111)

        at org.orbeon.oxf.xforms.XFormsModelSubmission.performDefaultAction(XFor
msModelSubmission.java:732)
        at org.orbeon.oxf.xforms.XFormsContainingDocument.dispatchEvent(XFormsCo
ntainingDocument.java:1155)
        at org.orbeon.oxf.xforms.XFormsContainingDocument.executeExternalEvent(X
FormsContainingDocument.java:935)
        at org.orbeon.oxf.xforms.processor.XFormsServer.executeExternalEventHand
leDeferredEvents(XFormsServer.java:346)
        at org.orbeon.oxf.xforms.processor.XFormsServer.doIt(XFormsServer.java:2
87)
        at org.orbeon.oxf.xforms.processor.XFormsServer.start(XFormsServer.java:
91)
        at org.orbeon.oxf.processor.pipeline.PipelineProcessor$11.run(PipelinePr
ocessor.java:644)
        at org.orbeon.oxf.processor.ProcessorImpl.executeChildren(ProcessorImpl.
java:518)
        at org.orbeon.oxf.processor.pipeline.PipelineProcessor.start(PipelinePro
cessor.java:641)
        at org.orbeon.oxf.processor.pipeline.PipelineProcessor$11.run(PipelinePr
ocessor.java:644)
        at org.orbeon.oxf.processor.ProcessorImpl.executeChildren(ProcessorImpl.
java:518)
        at org.orbeon.oxf.processor.pipeline.PipelineProcessor.start(PipelinePro
cessor.java:641)
        at org.orbeon.oxf.processor.pipeline.PipelineProcessor$1.getInput(Pipeli
neProcessor.java:136)
        at org.orbeon.oxf.processor.pipeline.PipelineProcessor$1.readImpl(Pipeli
neProcessor.java:85)
        at org.orbeon.oxf.processor.ProcessorImpl$6.read(ProcessorImpl.java:994)

when click on button (XFormsSubmissionUtils.java:111)  might be it gives error in ops 3.6.

Thanks in advance,
Laxminarayana.



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