Hi Patrick, [code]treeTable.getContainerDataSource()[/code] returns [code]com.vaadin.data.util.HierarchicalContainer[/code] and you're trying to cast it to [code]info.magnolia.ui.workbench.tree.HierarchicalJcrContainer[/code] which is not instance of [code]com.vaadin.data.util.HierarchicalContainer[/code]
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