java.lang.NullPointerException

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  • java.lang.NullPointerException at org.apache.wicket.ajax.form.AjaxFormChoiceComponentUpdatingBehavior.renderHead(AjaxFormChoiceComponentUpdatingBehavior.java:71) at org.apache.wicket.Component.renderHead(Component.java:2266) at org.apache.wicket.markup.html.internal.HtmlHeaderContainer$1.component(HtmlHeaderContainer.java:209) at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:843) at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:858) at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:883)
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