EM13c: ODA discovery fails with The following errors are found during discovery. Please examine the error messages and the targets being discovered if any (Doc ID 2356227.1)

emoms.trc

[[ACTIVE] ExecuteThread: '19' for queue: 'weblogic.kernel.Default (self-tuning)'] ERROR discoverymodel.OdaDiscovery logp.251 - Error in do discovery
  Cannot open file: /tmp/Output
  Fail to login using the root discovery credentials.


2018-01-04 16:26:41,824 [[ACTIVE] ExecuteThread: '21' for queue: 'weblogic.kernel.Default (self-tuning)'] ERROR discoverymodel.OdaDiscovery logp.251 - Get credential reference 'ODA_TEST_ROOT' throws EMCredentialException:oracle.sysman.emSDK.core.sec.credstore.EMCredentialException: Passwords do not match.
2018-01-04 16:27:02,618 [[ACTIVE] ExecuteThread: '12' for queue: 'weblogic.kernel.Default (self-tuning)'] ERROR discoverymodel.OdaDiscovery logp.251 - Error in do discovery
  testoda6 is not an ODA box.


2018-01-09 13:29:35,491 [[ACTIVE] ExecuteThread: '26' for queue: 'weblogic.kernel.Default (self-tuning)'] ERROR discoverymodel.OdaDiscovery logp.251 - getCredential throws Exception: java.lang.NullPointerException
2018-01-09 13:29:35,494 [[ACTIVE] ExecuteThread: '26' for queue: 'weblogic.kernel.Default (self-tuning)'] WARN errPopup.ErrorPopupUtil logp.251 - java.lang.NullPointerException : java.lang.NullPointerException
at com.sun.faces.application.ActionListenerImpl.processAction(Unknown Source)
at org.apache.myfaces.trinidad.component.UIXCommand.broadcast(UIXCommand.java:190)
at org.apache.myfaces.trinidad.component.UIXComponent.broadcastInContext(UIXComponent.java:364)
at org.apache.myfaces.trinidad.component.WrapperEvent.broadcastWrappedEvent(WrapperEvent.java:82)
at oracle.adf.view.rich.component.fragment.UIXInclude.broadcast(UIXInclude.java:111)
at org.apache.myfaces.trinidad.component.UIXComponent.broadcastInContext(UIXComponent.java:364)
at org.apache.myfaces.trinidad.component.WrapperEvent.broadcastWrappedEvent(WrapperEvent.java:82)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent$1.run(ContextSwitchingComponent.java:168)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent._processPhase(ContextSwitchingComponent.java:510)
at oracle.adf.view.rich.component.fragment.ContextSwitchingComponent.broadcast(ContextSwitchingComponent.java:171)
at oracle.adf.view.rich.component.fragment.UIXInclude.broadcast(UIXInclude.java:115)
at javax.faces.component.UIViewRoot.broadcastEvents(Unknown Source)
at javax.faces.component.UIViewRoot.processApplication(Unknown Source)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._invokeApplication(LifecycleImpl.java:1074)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:402)
at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:225)

Console message:

"The following errors are found during discovery. Please examine the error messages and the targets being discovered if any. "

OR

java.lang.NullPointerException
#{pageFlowScope.trainBean.doNext}: java.lang.NullPointerException