Headless Client shutdown

It was different last time, but now I’ve added the force argument. And I still get the error page.

org.apache.wicket.WicketRuntimeException: Exception in rendering component: LABEL(web)[name:btn_delete,x:736,y:0,width:24,height:23,label:] 
    	at org.apache.wicket.Component.renderComponent(Component.java:2764) 
    	at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1559) 
    	at com.servoy.j2db.server.headlessclient.dataui.WebBaseSubmitLink.onRender(WebBaseSubmitLink.java:179) 
    	at org.apache.wicket.Component.render(Component.java:2525) 
    	at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1461) 
    	at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1624) 
    	at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1548) 
    	at org.apache.wicket.Component.renderComponent(Component.java:2725) 
    	at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1559) 
    	at com.servoy.j2db.server.headlessclient.dataui.WebDataRenderer.onRender(WebDataRenderer.java:422) 
    	at org.apache.wicket.Component.render(Component.java:2525) 
    	at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1461) 
    	at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1624) 
    	at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1548) 
    	at org.apache.wicket.Component.renderComponent(Component.java:2725) 
    	at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1559) 
    	at org.apache.wicket.Component.render(Component.java:2525) 
    	at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1461) 
    	at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1624) 
    	at org.apache.wicket.MarkupContainer.renderAssociatedMarkup(MarkupContainer.java:717) 
    	at org.apache.wicket.markup.html.panel.Panel.onComponentTagBody(Panel.java:114) 
    	at org.apache.wicket.Component.renderComponent(Component.java:2725) 
    	at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1559) 
    	at org.apache.wicket.Component.render(Component.java:2525) 
    	at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1461) 
    	at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1624) 
    	at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1548) 
    	at org.apache.wicket.Component.renderComponent(Component.java:2725) 
    	at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1559) 
    	at com.servoy.j2db.server.headlessclient.dataui.WebTabPanel.onRender(WebTabPanel.java:476) 
    	at org.apache.wicket.Component.render(Component.java:2525) 
    	at org.apache.wicket.Component.renderComponent(Component.java:2666) 
    	at org.apache.wicket.ajax.AjaxRequestTarget.respondComponent(AjaxRequestTarget.java:876) 
    	at org.apache.wicket.ajax.AjaxRequestTarget.respondComponents(AjaxRequestTarget.java:680) 
    	at org.apache.wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.java:590) 
    	at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:105) 
    	at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1260) 
    	at org.apache.wicket.RequestCycle.step(RequestCycle.java:1331) 
    	at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1438) 
    	at org.apache.wicket.RequestCycle.request(RequestCycle.java:546) 
    	at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:486) 
    	at com.servoy.j2db.server.servlets.Zl.doGet(Zl.java:9) 
    	at org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:138) 
    	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) 
    	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
    	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.valves.AccessLogValve.invoke(AccessLogValve.java:567) 
    	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.Http11Processor.process(Http11Processor.java:849) 
    	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) 
    	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454) 
    	at java.lang.Thread.run(Unknown Source) 
    Caused by: java.lang.NullPointerException 
    	at com.servoy.j2db.server.headlessclient.dataui.WebBaseSubmitLink$2.getObject(WebBaseSubmitLink.java:393) 
    	at com.servoy.j2db.server.headlessclient.dataui.WebBaseSubmitLink$2.getObject(WebBaseSubmitLink.java:1) 
    	at org.apache.wicket.model.Model.getObject(Model.java:1) 
    	at org.apache.wicket.AttributeModifier.getReplacementOrNull(AttributeModifier.java:378) 
    	at org.apache.wicket.AttributeModifier.replaceAttributeValue(AttributeModifier.java:280) 
    	at org.apache.wicket.AttributeModifier.onComponentTag(AttributeModifier.java:243) 
    	at org.apache.wicket.Component.renderComponentTag(Component.java:4305) 
    	at org.apache.wicket.Component.renderComponent(Component.java:2716) 
    	... 57 more