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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)