Class cast Exception from org.ofbiz.manufacturing to org.opentaps.manufacturing

Hello All,

I am using opentaps-1.0.4. I am getting the following exception when I am
trying to create a bill of material for a product
org.ofbiz.base.util.GeneralException: Error running BSH script at location
[component://manufacturing/webapp/manufacturing/WEB-INF/actions/bom/BomSimulation.bsh]:
org.ofbiz.base.util.GeneralException: Error running BSH script at
[component://manufacturing/webapp/manufacturing/WEB-INF/actions/bom/BomSimulation.bsh],
line [47]: Sourced file:
component://manufacturing/webapp/manufacturing/WEB-INF/actions/bom/BomSimulation.bsh
: Typed variable declaration : at Line: 47 : in file:
component://manufacturing/webapp/manufacturing/WEB-INF/actions/bom/BomSimulation.bsh
: ( BOMNode ) treeQtyIt .next ( ) 

Target exception: java.lang.ClassCastException: Cannot cast
org.opentaps.common.manufacturing.bom.BomNode to
org.ofbiz.manufacturing.bom.BOMNode
 (Sourced file:
component://manufacturing/webapp/manufacturing/WEB-INF/actions/bom/BomSimulation.bsh
: Typed variable declaration) (Error running BSH script at
[component://manufacturing/webapp/manufacturing/WEB-INF/actions/bom/BomSimulation.bsh],
line [47]: Sourced file:
component://manufacturing/webapp/manufacturing/WEB-INF/actions/bom/BomSimulation.bsh
: Typed variable declaration : at Line: 47 : in file:
component://manufacturing/webapp/manufacturing/WEB-INF/actions/bom/BomSimulation.bsh
: ( BOMNode ) treeQtyIt .next ( ) 

Target exception: java.lang.ClassCastException: Cannot cast
org.opentaps.common.manufacturing.bom.BomNode to
org.ofbiz.manufacturing.bom.BOMNode
 (Sourced file:
component://manufacturing/webapp/manufacturing/WEB-INF/actions/bom/BomSimulation.bsh
: Typed variable declaration))
        at
org.ofbiz.widget.screen.ModelScreenAction$Script.runAction(ModelScreenAction.java:395)
        at
org.ofbiz.widget.screen.ModelScreenAction.runSubActions(ModelScreenAction.java:121)
        at
org.ofbiz.widget.screen.ModelScreenWidget$Section.renderWidgetString(ModelScreenWidget.java:240)
        at
org.ofbiz.widget.screen.ModelScreen.renderScreenString(ModelScreen.java:138)
        at 
org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:108)
        at org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:93)
        at
org.ofbiz.widget.screen.ScreenWidgetViewHandler.render(ScreenWidgetViewHandler.java:81)

can any one please tell me how to resolve this exception

Thanks,
Anil Sharma.
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