Model.AppModuleImpl cannot be cast to model.MantainScreenAppModuleImpl

hi am having this error when trying to run my application,am in jdeveloper 11.1.1.6.0
<oracle.adf.view.rich.component.fragment.UIXRegion> <ADF_FACES-00009> <Error processing viewId: /maintainschema-task-flow/maintainSchema URI: /Re-design/maintainSchema.jsff actual-URI: /Re-design/m
aintainSchema.jsff.
javax.faces.FacesException: javax.el.ELException: java.lang.ClassCastException: model.AppModuleImpl cannot be cast to model.MantainScreenAppModuleImpl
        at javax.faces.component.UISelectItems.getValue(UISelectItems.java:144)
        at oracle.adfinternal.view.faces.renderkit.rich.SelectItemUtils.addSelectItems(SelectItemUtils.java:184)
        at oracle.adfinternal.view.faces.renderkit.rich.SelectItemUtils.getSelectItems(SelectItemUtils.java:78)
        at oracle.adfinternal.view.faces.renderkit.rich.SimpleSelectOneChoiceRenderer.getSelectItems(SimpleSelectOneChoiceRenderer.java:98)
        at oracle.adfinternal.view.faces.renderkit.rich.SimpleSelectBaseRenderer._renderContent(SimpleSelectBaseRenderer.java:208)
        at oracle.adfinternal.view.faces.renderkit.rich.SimpleSelectBaseRenderer.renderElementContent(SimpleSelectBaseRenderer.java:122)
        at oracle.adfinternal.view.faces.renderkit.rich.FormInputRenderer.encodeAllAsElement(FormInputRenderer.java:152)
        at oracle.adfinternal.view.faces.renderkit.rich.FormElementRenderer.encodeAll(FormElementRenderer.java:164)
        at oracle.adf.view.rich.render.RichRenderer.delegateRenderer(RichRenderer.java:1627)
        at oracle.adfinternal.view.faces.renderkit.rich.LabeledInputRenderer.renderFieldCellContents(LabeledInputRenderer.java:228)
        at oracle.adfinternal.view.faces.renderkit.rich.LabelLayoutRenderer.renderFieldCell(LabelLayoutRenderer.java:528)
        at oracle.adfinternal.view.faces.renderkit.rich.LabelLayoutRenderer.encodeAll(LabelLayoutRenderer.java:305)
        at oracle.adfinternal.view.faces.renderkit.rich.LabeledInputRenderer.encodeAll(LabeledInputRenderer.java:215)
        at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1396)
        at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:341)
        at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:767)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:937)
        at org.apache.myfaces.trinidad.render.CoreRenderer.encodeChild(CoreRenderer.java:405)
        at oracle.adf.view.rich.render.RichRenderer.encodeChild(RichRenderer.java:2633)
        at oracle.adfinternal.view.faces.renderkit.rich.PanelFormLayoutRenderer._encodeFormItem(PanelFormLayoutRenderer.java:1015)
        at oracle.adfinternal.view.faces.renderkit.rich.PanelFormLayoutRenderer.access$100(PanelFormLayoutR

javax.faces.FacesException: javax.el.ELException: java.lang.ClassCastException: model.AppModuleImpl cannot be cast to model.MantainScreenAppModuleImpl
at javax.faces.component.UISelectItems.getValue(UISelectItems.java:144)Can you check if there is some LOV which has issues in rendering in the MaintainScreen.jsff
See if the same is rendered fine from the BC4J AM tester , this will help to narrow down the issue.

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