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oracle.sysman.emcp.exception.DatabaseUnavailableException: Database instance unavailable.	at oracle.sysman.emcp.DatabaseChecks.throwDBUnavailableException(DatabaseChecks.java:151)	at oracle.sysman.emcp.DatabaseChecks.checkDbAvailabilityImpl(DatabaseChecks.java:139)	at oracle.sysman.emcp.DatabaseChecks.checkDbAvailability(DatabaseChecks.java:163)	at oracle.sysman.emcp.DatabaseChecks.getDbServiceName(DatabaseChecks.java:582)	at oracle.sysman.emcp.EMConfigAssistant.performConfiguration(EMConfigAssistant.java:1267)	at oracle.sysman.emcp.EMConfigAssistant.statusMain(EMConfigAssistant.java:573)	at oracle.sysman.emcp.EMConfigAssistant.main(EMConfigAssistant.java:521)