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

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java.lang.NullPointerException: 	at com.liferay.portlet.layoutsadmin.action.EditLayoutSetAction.updateLogo(EditLayoutSetAction.java:209)	at com.liferay.portlet.layoutsadmin.action.EditLayoutSetAction.updateLayoutSet(EditLayoutSetAction.java:170)	at com.liferay.portlet.layoutsadmin.action.EditLayoutSetAction.processAction(EditLayoutSetAction.java:80)	at com.liferay.portal.struts.PortletRequestProcessor.process(PortletRequestProcessor.java:175)	at com.liferay.portlet.StrutsPortlet.processAction(StrutsPortlet.java:190)	at com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:70)	at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:48)	at com.liferay.portlet.InvokerPortletImpl.invoke(InvokerPortletImpl.java:651)	at com.liferay.portlet.InvokerPortletImpl.invokeAction(InvokerPortletImpl.java:686)	at com.liferay.portlet.InvokerPortletImpl.processAction(InvokerPortletImpl.java:361)	at com.liferay.portal.action.LayoutAction.processPortletRequest(LayoutAction.java:845)	at com.liferay.portal.action.LayoutAction.processLayout(LayoutAction.java:633)	at com.liferay.portal.action.LayoutAction.execute(LayoutAction.java:244)	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)	at com.liferay.portal.struts.PortalRequestProcessor.process(PortalRequestProcessor.java:174)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)	at com.liferay.portal.servlet.MainServlet.callParentService(MainServlet.java:533)