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

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java.lang.NullPointerException:
at oracle.sysman.oii.oiix.OiixPathOps.concatPath(OiixPathOps.java:553)
at oracle.sysman.oii.oiic.OiicStandardInventorySession.updateProperties(OiicStandardInventorySession.java:426)
at oracle.sysman.oii.oiic.OiicStandardInventorySession.initSession(OiicStandardInventorySession.java:254)
at oracle.sysman.oii.oiic.OiicStandardInventorySession.initSession(OiicStandardInventorySession.java:229)
at oracle.sysman.oii.oiic.OiicStandardInventorySession.initSession(OiicStandardInventorySession.java:178)
at oracle.sysman.emcp.util.OUIInventoryUtil.getInstallInventory(OUIInventoryUtil.java:117)
at oracle.sysman.emcp.util.OUIInventoryUtil.getAllCentralAgentHomeLoc(OUIInventoryUtil.java:586)
at oracle.sysman.emcp.util.CentralAgentUtil.getCentralAgentHomeAndURL(CentralAgentUtil.java:296)
at oracle.sysman.emcp.EMConfig.getCentralAgentHomeAndURL(EMConfig.java:616)
at oracle.sysman.assistants.util.OsUtilsBase.enumerateAgents(OsUtilsBase.java:1638)
at oracle.sysman.assistants.dbca.ui.ManagementOptionsPage.initializePage(ManagementOptionsPage.java:402)
at oracle.sysman.assistants.util.wizard.WizardPageExt.onSetActive(WizardPageExt.java:94)
at oracle.sysman.assistants.dbca.ui.ManagementOptionsPage.onSetActive(ManagementOptionsPage.java:482)
at oracle.sysman.assistants.util.wizard.WizardExt.wizardSelectionChanged(WizardExt.java:166)
at oracle.ewt.wizard.BaseWizard.processWizardEvent(Unknown Source)
at oracle.ewt.wizard.BaseWizard.processEventImpl(Unknown Source)
at oracle.ewt.lwAWT.LWComponent.redispatchEvent(Unknown Source)
at oracle.ewt.lwAWT.LWComponent.processEvent(Unknown Source)
at oracle.ewt.wizard.BaseWizard.selectPage(Unknown Source)
at oracle.ewt.wizard.BaseWizard.doNext(Unknown Source)
at oracle.sysman.assistants.util.wizard.WizardExt.doNext(WizardExt.java:237)
at oracle.ewt.wizard.BaseWizard$Action.actionPerformed(Unknown Source)
at oracle.ewt.button.PushButton.processActionEvent(Unknown Source)
at oracle.ewt.button.PushButton.processEventImpl(Unknown Source)
at oracle.ewt.lwAWT.LWComponent.redispatchEvent(Unknown Source)
at oracle.ewt.lwAWT.LWComponent.processEvent(Unknown Source)
at oracle.ewt.button.PushButton.activate(Unknown Source)
at oracle.ewt.lwAWT.AbstractButton.processMouseReleased(Unknown Source)
at oracle.ewt.lwAWT.AbstractButton.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Component.java:4897)
at java.awt.Container.processEvent(Container.java:1569)
at oracle.ewt.lwAWT.LWComponent.processEventImpl(Unknown Source)
at oracle.ewt.button.PushButton.processEventImpl(Unknown Source)
at oracle.ewt.lwAWT.LWComponent.redispatchEvent(Unknown Source)
at oracle.ewt.lwAWT.LWComponent.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Component.java:3615)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
at java.awt.Container.dispatchEventImpl(Container.java:1613)
at java.awt.Window.dispatchEventImpl(Window.java:1606)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)

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