java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at oracle.adf.model.binding.DCIteratorBinding.executeQueryIfNeeded(DCIteratorBinding.java:2160)
at oracle.adf.model.binding.DCBindingContainer.internalRefreshControl(DCBindingContainer.java:3244)
at oracle.adf.model.binding.DCBindingContainer.refresh(DCBindingContainer.java:2874)
at oracle.adf.controller.v2.lifecycle.PageLifecycleImpl.prepareModel(PageLifecycleImpl.java:115)
at oracle.adf.controller.v2.lifecycle.Lifecycle$2.execute(Lifecycle.java:137)
at oracle.adfinternal.controller.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:197)
at oracle.adfinternal.controller.faces.lifecycle.ADFPhaseListener.access$400(ADFPhaseListener.java:23)
at oracle.adfinternal.controller.faces.lifecycle.ADFPhaseListener$PhaseInvokerImpl.startPageLifecycle(ADFPhaseListener.java:238)
at oracle.adfinternal.controller.faces.lifecycle.ADFPhaseListener$1.after(ADFPhaseListener.java:274)

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