Can you disable the scheduled event, start the application, and trigger the event manually using some button in your interface? In that case you should be able to start your application and see the full stacktrace of what went wrong in your microflow.
We got this same error since yesterday afternoon in our logs. No changes to the application has been made.
2012-03-09 00:05:34.790 ERROR - ActionManager: Exception in scheduled event 'null' 2012-03-09 00:05:34.790 ERROR ActionManagercom.mendix.core.CoreException: Exception occurred in action 'ClusterManagerAction', all database changes executed by this action were rolled back at com.mendix.core.actionmanagement.CoreAction.d(SourceFile:553) Caused by: com.mendix.core.CoreException: af: An exception has occurred for the following request(s): jE (depth = 0): //System.XASInstance[LastUpdate< '1331243734774'] at it.b(SourceFile:167) Caused by: af: An exception has occurred for the following request(s): jE (depth = 0): //System.XASInstance[LastUpdate< '1331243734774'] Caused by: af: Exception occurred while retrieving data. (SQL State: 42000, Error Code: 1031) Caused by: java.sql.SQLSyntaxErrorException: ORA-01031: insufficient privileges
Were you able to resolve this?
*UPDATE : * This does not happen after start up. Application has been running for weeks now.
Are you sure that Microflow is working correctly? Perhaps you forgot to include a java action?