Faceplate_Error

In DeltaV Operate every module are working fine except Discrete Valve Module.When i open faceplate of this type module then DeltaV  create error : RT_NULL_ITEM and faceplate permit option has gone to ESD mode.Please find below screenshots of error and warning ::
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As a result i can not use these type of module from DV graphics page.Does anyone have any idea why this is happening?


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