java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at portlets.contentmanagement.util.ContentApprovalImpl.moveApprovedContent(ContentApprovalImpl.jcs:901)
at portlets.contentmanagement.util.ContentApprovalImpl.approve(ContentApprovalImpl.jcs:751)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.bea.wlw.runtime.core.dispatcher.DispMethod.invoke(DispMethod.java:371)
at com.bea.wlw.runtime.core.container.Invocable.invoke(Invocable.java:423)
at com.bea.wlw.runtime.core.container.Invocable.invoke(Invocable.java:396)
at com.bea.wlw.runtime.core.container.Invocable.invoke(Invocable.java:248)
at com.bea.wlw.runtime.jcs.container.JcsContainer.invoke(JcsContainer.java:85)
at com.bea.wlw.runtime.core.bean.BaseContainerBean.invokeBase(BaseContainerBean.java:224)
at com.bea.wlw.runtime.core.bean.SLSBContainerBean.invoke(SLSBContainerBean.java:103)
at com.bea.wlwgen.StatelessContainer_ly05hg_ELOImpl.invoke(StatelessContainer_ly05hg_ELOImpl.java:207)
at com.bea.wlwgen.GenericStatelessSLSBContAdpt.invokeOnBean(GenericStatelessSLSBContAdpt.java:62)
at com.bea.wlw.runtime.core.bean.BaseDispatcherBean.runAsInvoke(BaseDispatcherBean.java:153)
at com.bea.wlw.runtime.core.bean.BaseDispatcherBean.invoke(BaseDispatcherBean.java:54)
at com.bea.wlw.runtime.core.bean.SyncDispatcherBean.invoke(SyncDispatcherBean.java:168)
at com.bea.wlw.runtime.core.bean.SyncDispatcher_k1mrl8_EOImpl.invoke(SyncDispatcher_k1mrl8_EOImpl.java:46)
at com.bea.wlw.runtime.core.dispatcher.Dispatcher.remoteDispatch(Dispatcher.java:161)
at com.bea.wlw.runtime.core.dispatcher.ServiceHandleImpl.invoke(ServiceHandleImpl.java:436)
at com.bea.wlw.runtime.core.dispatcher.WlwProxyImpl._invoke(WlwProxyImpl.java:326)
at com.bea.wlw.runtime.core.dispatcher.WlwProxyImpl.invoke(WlwProxyImpl.java:315)
at undefined.$Proxy119.approve(Unknown Source)
at portlets.contentmanagement.approval.ApprovalController.approve(ApprovalController.jpf:665)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.bea.wlw.netui.pageflow.FlowController.invokeActionMethod(FlowController.java:1519)
at com.bea.wlw.netui.pageflow.FlowController.getActionMethodForward(FlowController.java:1445)
at com.bea.wlw.netui.pageflow.FlowController.internalExecute(FlowController.java:776)
at com.bea.wlw.netui.pageflow.PageFlowController.internalExecute(PageFlowController.java:211)
at com.bea.wlw.netui.pageflow.FlowController.execute(FlowController.java:606)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor.processActionPerform(PageFlowRequestProcessor.java:1354)
at com.bea.wlw.netui.pageflow.PageFlowRequestProcessor.process(PageFlowRequestProcessor.java:650)
at com.bea.wlw.netui.pageflow.AutoRegisterActionServlet.process(AutoRegisterActionServlet.java:527)
at com.bea.wlw.netui.pageflow.PageFlowActionServlet.process(PageFlowActionServlet.java:152)
at com.bea.wlw.netui.pageflow.PageFlowUtils.strutsLookup(PageFlowUtils.java:1617)
at com.bea.portlet.adapter.scopedcontent.ScopedContentCommonSupport.executeAction(ScopedContentCommonSupport.java:561)
at com.bea.portlet.adapter.scopedcontent.ScopedContentCommonSupport.processActionInternal(ScopedContentCommonSupport.java:121)
at com.bea.portlet.adapter.scopedcontent.PageFlowStubImpl.processAction(PageFlowStubImpl.java:98)
at com.bea.netuix.servlets.controls.content.NetuiContent.raiseScopedAction(NetuiContent.java:149)
at com.bea.netuix.servlets.controls.content.NetuiContent.raiseScopedAction(NetuiContent.java:108)
at com.bea.netuix.servlets.controls.content.NetuiContent.handlePostbackData(NetuiContent.java:223)
at com.bea.netuix.nf.ControlLifecycle$3.visit(ControlLifecycle.java:171)

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