org.apache.wicket.WicketRuntimeException: Internal error cloning object

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org.apache.wicket.WicketRuntimeException: Internal error cloning object
at org.apache.wicket.core.util.lang.WicketObjects.cloneObject(WicketObjects.java:361)
at org.apache.wicket.devutils.debugbar.PageSizeDebugPanel$2.getObject(PageSizeDebugPanel.java:96)
at org.apache.wicket.Component.getDefaultModelObject(Component.java:1605)
at org.apache.wicket.Component.getDefaultModelObjectAsString(Component.java:1633)
at org.apache.wicket.markup.html.basic.Label.onComponentTagBody(Label.java:131)
at org.apache.wicket.markup.html.panel.DefaultMarkupSourcingStrategy.onComponentTagBody(DefaultMarkupSourcingStrategy.java:71)
at org.apache.wicket.Component.internalRenderComponent(Component.java:2529)
at org.apache.wicket.markup.html.WebComponent.onRender(WebComponent.java:56)
at org.apache.wicket.Component.internalRender(Component.java:2359)
at org.apache.wicket.Component.render(Component.java:2287)
at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1392)
at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1557)
at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1532)
at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1487)
at org.apache.wicket.markup.html.link.AbstractLink.onComponentTagBody(AbstractLink.java:186)
at org.apache.wicket.markup.html.panel.DefaultMarkupSourcingStrategy.onComponentTagBody(DefaultMarkupSourcingStrategy.java:71)
at org.apache.wicket.Component.internalRenderComponent(Component.java:2529)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1496)
at org.apache.wicket.Component.internalRender(Component.java:2359)
at org.apache.wicket.Component.render(Component.java:2287)
at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1392)
at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1557)
at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1532)
at org.apache.wicket.MarkupContainer.renderAssociatedMarkup(MarkupContainer.java:689)
at org.apache.wicket.markup.html.panel.AssociatedMarkupSourcingStrategy.renderAssociatedMarkup(AssociatedMarkupSourcingStrategy.java:76)
at org.apache.wicket.markup.html.panel.PanelMarkupSourcingStrategy.onComponentTagBody(PanelMarkupSourcingStrategy.java:112)
at org.apache.wicket.Component.internalRenderComponent(Component.java:2529)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1496)
at org.apache.wicket.Component.internalRender(Component.java:2359)
at org.apache.wicket.Component.render(Component.java:2287)
at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1392)
at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1557)
at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1532)
at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1487)
at org.apache.wicket.markup.html.panel.DefaultMarkupSourcingStrategy.onComponentTagBody(DefaultMarkupSourcingStrategy.java:71)
at org.apache.wicket.Component.internalRenderComponent(Component.java:2529)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1496)
at org.apache.wicket.Component.internalRender(Component.java:2359)
at org.apache.wicket.Component.render(Component.java:2287)
at org.apache.wicket.markup.html.list.ListView.renderItem(ListView.java:584)
at org.apache.wicket.markup.html.list.ListView.renderChild(ListView.java:573)
at org.apache.wicket.markup.repeater.AbstractRepeater.onRender(AbstractRepeater.java:101)
at org.apache.wicket.Component.internalRender(Component.java:2359)
at org.apache.wicket.Component.render(Component.java:2287)
at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1392)
at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1557)
at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1532)
at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1487)
at org.apache.wicket.markup.html.panel.DefaultMarkupSourcingStrategy.onComponentTagBody(DefaultMarkupSourcingStrategy.java:71)
at org.apache.wicket.Component.internalRenderComponent(Component.java:2529)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1496)
at org.apache.wicket.Component.internalRender(Component.java:2359)
at org.apache.wicket.Component.render(Component.java:2287)
at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1392)

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