Error Inserting a record using Orbeon XForm

I get the following error (in ops.log file) when adding a record to the database:

2008-01-17 11:13:27,184 INFO ProcessorService - /xforms-hello/add - Timing: 312 - Cache hits for cache.main: 232, fault: 36, adds: 33, expirations: 0, success rate: 86%

2008-01-17 11:13:27,184 INFO ProcessorService - /xforms-hello/add - Received request

2008-01-17 11:13:28,059 INFO ProcessorService - /xforms-hello/add - Timing: 875 - Cache hits for cache.main: 18, fault: 13, adds: 15, expirations: 0, success rate: 58%

2008-01-17 11:13:28,059 ERROR XFormsServer - XForms - submission - xforms-submit-error throwable: org.orbeon.oxf.xforms.XFormsModelSubmission$XFormsSubmissionException: line 27 of oxf:/config/xforms-widgets.xsl (processing submission response): xforms:submission for submission id: add-submission, error code received when submitting instance: 500

oxf:/config/xforms-widgets.xsl, line 27, column -1: xforms:submission for submission id: add-submission, error code received when submitting instance: 500

at org.orbeon.oxf.xforms.XFormsModelSubmission.performDefaultAction(XFormsModelSubmission.java:855)

at org.orbeon.oxf.xforms.XFormsContainingDocument.dispatchEvent(XFormsContainingDocument.java:980)

at org.orbeon.oxf.xforms.action.actions.XFormsSendAction.execute(XFormsSendAction.java:45)

at org.orbeon.oxf.xforms.action.XFormsActionInterpreter.runActionXFormsActionInterpreter.java:122)

( at org.orbeon.oxf.xforms.action.actions.XFormsActionAction.execute(XFormsActionAction.java:32) at org.orbeon.oxf.xforms.action.XFormsActionInterpreter.runAction

((XFormsActionInterpreter.java:122) at org.orbeon.oxf.xforms.XFormsContainingDocument.runAction

((XFormsContainingDocument.java:1033) at org.orbeon.oxf.xforms.event.XFormsEventHandlerImpl.handleEvent(XFormsEventHandlerImpl.java:153) at org.orbeon.oxf.xforms.XFormsContainingDocument.dispatchEvent

((XFormsContainingDocument.java:961) at org.orbeon.oxf.xforms.XFormsContainingDocument.executeExternalEvent

((XFormsContainingDocument.java:809) at org.orbeon.oxf.xforms.processor.XFormsServer.executeExternalEventPrepareIfNecessary

((XFormsServer.java:283) at org.orbeon.oxf.xforms.processor.XFormsServer.doIt(XFormsServer.java:223)

( at org.orbeon.oxf.xforms.processor.XFormsServer.access$000(XFormsServer.java:47) at org.orbeon.oxf.xforms.processor.XFormsServer$1.readImpl(XFormsServer.java:73) at org.orbeon.oxf.processor.ProcessorImpl$7.read(ProcessorImpl.java:1030) at org.orbeon.oxf.processor.ProcessorImpl$ProcessorOutputImpl$ConcreteProcessorFilter$ForwarderProcessorOutput.read(ProcessorImpl.java:984) at org.orbeon.oxf.processor.ProcessorImpl.readInputAsSAX(ProcessorImpl.java:348) at org.orbeon.oxf.processor.validation.MSVValidationProcessor.access$700(MSVValidationProcessor.java:44) at org.orbeon.oxf.processor.validation.MSVValidationProcessor$5.readImpl(MSVValidationProcessor.java:219) at org.orbeon.oxf.processor.ProcessorImpl$7.read(ProcessorImpl.java:1030) at org.orbeon.oxf.processor.ProcessorImpl$ProcessorOutputImpl.read(ProcessorImpl.java:1213) at org.orbeon.oxf.processor.ProcessorImpl$ProcessorOutputImpl$ConcreteProcessorFilter.read(ProcessorImpl.java:1008) at org.orbeon.oxf.processor.ProcessorImpl$ProcessorOutputImpl.read(ProcessorImpl.java:1213) at org.orbeon.oxf.processor.ProcessorImpl.readInputAsSAX(ProcessorImpl.java:348) at org.orbeon.oxf.processor.serializer.legacy.XMLSerializer.readInput(XMLSerializer.java:58) at org.orbeon.oxf.processor.serializer.HttpTextSerializer.readInput(HttpTextSerializer.java:54) at org.orbeon.oxf.processor.serializer.HttpSerializerBase$1.read(HttpSerializerBase.java:151) at org.orbeon.oxf.processor.ProcessorImpl.readCacheInputAsObject(ProcessorImpl.java:488) at org.orbeon.oxf.processor.serializer.HttpSerializerBase.start(HttpSerializerBase.java:142) at org.orbeon.oxf.processor.pipeline.PipelineProcessor$11.run(PipelineProcessor.java:650) at org.orbeon.oxf.processor.ProcessorImpl.executeChildren(ProcessorImpl.java:554) at org.orbeon.oxf.processor.pipeline.PipelineProcessor.start(PipelineProcessor.java:647) at org.orbeon.oxf.processor.pipeline.choose.ConcreteChooseProcessor.start(ConcreteChooseProcessor.java:229) at org.orbeon.oxf.processor.pipeline.PipelineProcessor$11.run(PipelineProcessor.java:650) at org.orbeon.oxf.processor.ProcessorImpl.executeChildren(ProcessorImpl.java:554) at org.orbeon.oxf.processor.pipeline.PipelineProcessor.start(PipelineProcessor.java:647) at org.orbeon.oxf.pipeline.InitUtils.runProcessor(InitUtils.java:95) at org.orbeon.oxf.webapp.ProcessorService.service(ProcessorService.java:96) at org.orbeon.oxf.servlet.OPSServletDelegate.service(OPSServletDelegate.java:148) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.orbeon.oxf.servlet.OPSServlet.service(OPSServlet.java:75) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt

((LeaderFollowerWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)

( at java.lang.Thread.run(Thread.java:595)