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

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java.lang.NullPointerException:
at oracle.as.install.engine.modules.handler.engine.HandlerLauncher.execute(HandlerLauncher.java:198)
at oracle.as.install.engine.modules.handler.engine.HandlerEngine.execute(HandlerEngine.java:137)
at oracle.as.install.engine.modules.handler.HandlerModule.performOperation(HandlerModule.java:473)
at oracle.as.install.engine.modules.handler.HandlerModule.performInputValidations(HandlerModule.java:431)
at oracle.as.install.engine.modules.handler.HandlerModule.processModuleEvent(HandlerModule.java:351)
at oracle.as.install.engine.modules.util.PartnerModuleImpl.processEvent(PartnerModuleImpl.java:121)
at oracle.as.install.engine.InstallEngine.notifyListeners(InstallEngine.java:702)
at oracle.as.install.engine.InstallEngine.processEvent(InstallEngine.java:660)
at oracle.as.install.engine.modules.util.PartnerModuleImpl.notifyAllEventListenersHelper(PartnerModuleImpl.java:230)
at oracle.as.install.engine.modules.util.PartnerModuleImpl.notifyListeners(PartnerModuleImpl.java:194)
at oracle.as.install.engine.modules.presentation.PresentationModule.executeModifiedDWizardEvent(PresentationModule.java:682)
at oracle.as.install.engine.modules.presentation.ui.common.wizard.ModifiedDWizard.fireValidationEvent(ModifiedDWizard.java:3942)
at oracle.as.install.engine.modules.presentation.ui.common.wizard.ModifiedDWizard.doNext(ModifiedDWizard.java:1473)
at oracle.bali.ewt.wizard.BaseWizard$Action$1.run(BaseWizard.java:4072)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

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