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.