we are not able to delete the configuration. We are getting error like

jvm 1 | at org.apache.wicket.Component.beforeRender(Component.java:1022)
jvm 1 | at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1785)
jvm 1 | at org.apache.wicket.Component.onBeforeRender(Component.java:3798)
jvm 1 | at org.apache.wicket.Component.internalBeforeRender(Component.java:986)
jvm 1 | at org.apache.wicket.Component.beforeRender(Component.java:1022)
jvm 1 | at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1785)
jvm 1 | at org.apache.wicket.Component.onBeforeRender(Component.java:3798)
jvm 1 | at org.apache.wicket.Page.onBeforeRender(Page.java:823)
jvm 1 | at com.pmease.quickbuild.web.page.BasePage.onBeforeRender(BasePage.java:342)
jvm 1 | at org.apache.wicket.Component.internalBeforeRender(Component.java:986)
jvm 1 | at org.apache.wicket.Component.beforeRender(Component.java:1022)
jvm 1 | at org.apache.wicket.Component.internalPrepareForRender(Component.java:2191)
jvm 1 | at org.apache.wicket.Page.internalPrepareForRender(Page.java:280)
jvm 1 | at org.apache.wicket.Component.render(Component.java:2280)
jvm 1 | at org.apache.wicket.Page.renderPage(Page.java:1035)
jvm 1 | at org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:105)
jvm 1 | at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:182)
jvm 1 | at org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:147)
jvm 1 | at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:719)
jvm 1 | at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:63)
jvm 1 | at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:210)
jvm 1 | at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:253)
jvm 1 | at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:162)
jvm 1 | at org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:137)
jvm 1 | at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
jvm 1 | at com.pmease.quickbuild.web.MainServlet.service(MainServlet.java:119)
jvm 1 | at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
jvm 1 | at org.eclipse.equinox.http.helper.FilterServletAdaptor$FilterChainImpl.doFilter(FilterServletAdaptor.java:56)
jvm 1 | at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:78)
jvm 1 | at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:131)
jvm 1 | at org.eclipse.equinox.http.helper.FilterServletAdaptor.service(FilterServletAdaptor.java:37)
jvm 1 | at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
jvm 1 | at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1221)
jvm 1 | at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:206)
jvm 1 | at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:179)
jvm 1 | at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
jvm 1 | at com.pmease.quickbuild.Quickbuild$DisableTraceFilter.doFilter(Quickbuild.java:973)
jvm 1 | at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
jvm 1 | at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
jvm 1 | at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
jvm 1 | at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
jvm 1 | at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
jvm 1 | at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
jvm 1 | at org.mortbay.jetty.Server.handle(Server.java:326)
jvm 1 | at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
jvm 1 | at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)
jvm 1 | at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
jvm 1 | at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
jvm 1 | at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
jvm 1 | at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
jvm 1 | at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
jvm 1 | Caused by: org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [com.pmease.quickbuild.model.User#14]
jvm 1 | at org.hibernate.impl.SessionFactoryImpl$2.handleEntityNotFound(SessionFactoryImpl.java:435)
jvm 1 | at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:233)