java.lang.IllegalArgumentException: 1

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java.lang.IllegalArgumentException: 1
at javax.faces.component.UIComponentBase.validateId(UIComponentBase.java:586)
at javax.faces.component.UIComponentBase.setId(UIComponentBase.java:412)
at org.primefaces.model.menu.BaseMenuModel.generateUniqueIds(BaseMenuModel.java:56)
at org.primefaces.model.menu.BaseMenuModel.generateUniqueIds(BaseMenuModel.java:44)
at org.primefaces.model.menu.DefaultMenuModel.generateUniqueIds(DefaultMenuModel.java:28)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)

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