A child with id 'sideHeaderColumns' already exists: [OrganisatieMeeteenhedenTree [Component id = boom]]

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  • Stack trace

    • java.lang.IllegalArgumentException: A child with id 'sideHeaderColumns' already exists: [OrganisatieMeeteenhedenTree [Component id = boom]] at org.apache.wicket.MarkupContainer.add( at org.apache.wicket.extensions.markup.html.tree.table.TreeTable.addHeader( at org.apache.wicket.extensions.markup.html.tree.table.TreeTable.onBeforeAttach( at org.apache.wicket.extensions.markup.html.tree.AbstractTree.onBeforeRenderInternal( at org.apache.wicket.extensions.markup.html.tree.AbstractTree.access$300( at org.apache.wicket.extensions.markup.html.tree.AbstractTree$TreeItem.onBeforeRender( at org.apache.wicket.Component.internalBeforeRender(

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