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java.lang.NullPointerException: 	at org.obiba.onyx.core.data.VariableDataSource.getValue(VariableDataSource.java:90)	at org.obiba.onyx.core.data.VariableDataSource.getData(VariableDataSource.java:80)	at org.obiba.onyx.jade.core.service.impl.DefaultActiveInstrumentRunServiceImpl.updateReadOnlyInputParameterRunValue(DefaultActiveInstrumentRunServiceImpl.java:368)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)	at $Proxy140.updateReadOnlyInputParameterRunValue(Unknown Source)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.apache.wicket.proxy.LazyInitProxyFactory$JdkHandler.invoke(LazyInitProxyFactory.java:416)	at org.apache.wicket.proxy.$Proxy141.updateReadOnlyInputParameterRunValue(Unknown Source)	at org.obiba.onyx.jade.core.wicket.instrument.InstrumentManualOutputParameterPanel$OutputFragment.(InstrumentManualOutputParameterPanel.java:106)	at org.obiba.onyx.jade.core.wicket.instrument.InstrumentManualOutputParameterPanel.(InstrumentManualOutputParameterPanel.java:78)	at org.obiba.onyx.jade.core.wicket.instrument.InstrumentLaunchPanel.(InstrumentLaunchPanel.java:144)	at org.obiba.onyx.jade.core.wicket.wizard.InstrumentLaunchStep$1.(InstrumentLaunchStep.java:90)	at org.obiba.onyx.jade.core.wicket.wizard.InstrumentLaunchStep.onStepInNext(InstrumentLaunchStep.java:90)	at org.obiba.onyx.wicket.wizard.WizardForm.gotoNext(WizardForm.java:270)	at org.obiba.onyx.wicket.wizard.WizardForm.onNextSubmit(WizardForm.java:189)	at org.obiba.onyx.wicket.wizard.WizardForm$1.onSubmit(WizardForm.java:94)	at org.apache.wicket.ajax.markup.html.form.AjaxButton$1.onSubmit(AjaxButton.java:102)	at org.apache.wicket.ajax.form.AjaxFormSubmitBehavior.onEvent(AjaxFormSubmitBehavior.java:143)	at org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:177)	at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:299)	at org.apache.wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:119)	at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)	at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250)	at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)	at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428)	at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)	at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:468)	at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:301)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)	at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)	at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:574)	at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1527)	at java.lang.Thread.run(Unknown Source)