oracle.jbo.PersistenceException: JBO-34000: Definition class name missing in XML file of type task Flow

Oracle JDeveloper 11.1.2.3

While doing some copying of Project Source File Content into New Application Source, upon running the page found below error -

oracle.jbo.PersistenceException: JBO-34000: Definition class name missing in XML file of type task Flow

I was copying the content from DataBindings.cpx into new DataBindings.cpx file for a new application & missed to include <definitionFactories/> .

Solution - Open DataBinding.cpx file. Paste the below lines -
<definitionFactories>
        <factory nameSpace="http://xmlns.oracle.com/adf/controller/binding"
                 className="oracle.adf.controller.internal.binding.TaskFlowBindingDefFactoryImpl"/>
        <dtfactory className="oracle.adf.controller.internal.dtrt.binding.BindingDTObjectFactory"/>
        <factory nameSpace="http://xmlns.oracle.com/adfm/dvt"
                 className="oracle.adfinternal.view.faces.dvt.model.binding.FacesBindingFactory"/></definitionFactories>

This should resolve the issue.