standby database version does not match master database

  Explanation:  The version time and date  stamp  in  the  standby
  database  root does not match the version time and date stamp in
  master database root.  Also, it may be possible that the standby
  database  was  backed  up and restored, thereby invalidating the
  abaility to be replicated.

  User Action:  Ensure that  the  specified  standby  database  is
  correct and restored from a master database backup file.