error when creating a dynamic list

java.lang.IllegalArgumentException
        at org.kalmeo.util.LinkedList.add(LinkedList.java:410)
        at org.kalmeo.kuix.core.model.DataProvider.addItem(DataProvider.java:391)
        at com.elibom.market.j2me.midlet.frames.SucursalesClienteFrame.addItem(+40)
        at com.elibom.market.j2me.midlet.frames.SucursalesClienteFrame.cargarDatos(SucursalesClienteFrame.java:79)
        at com.elibom.market.j2me.midlet.frames.SucursalesClienteFrame.onAdded(SucursalesClienteFrame.java:67)
        at org.kalmeo.util.frame.FrameHandler.pushFrame(FrameHandler.java:164)
        at com.elibom.market.j2me.midlet.frames.ClientesFrame.onMessage(ClientesFrame.java:59)
        at org.kalmeo.util.frame.FrameHandler.processMessage(FrameHandler.java:253)
        at org.kalmeo.kuix.core.Kuix.callActionMethod(Kuix.java:608)
        at org.kalmeo.kuix.widget.ActionWidget.processActionEvent(ActionWidget.java:115)
        at org.kalmeo.kuix.widget.ActionWidget.processKeyEvent(ActionWidget.java:82)
        at org.kalmeo.kuix.core.focus.FocusManager.processKeyEvent(FocusManager.java:275)
        at org.kalmeo.kuix.widget.Screen$2.processKeyEvent(Screen.java:313)
        at org.kalmeo.kuix.core.KuixCanvas$2.run(KuixCanvas.java:295)
        at org.kalmeo.util.worker.Worker.run(Worker.java:164)