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You should check the alert.log in order to identify the real issue.
This indicates the database is either starting up or shutting down already and so is in an inconsistent state as Lajos pointed out you will need to have a look in your alert log and see what is actually happening. This should be located in the bdump directory assuming this is the background_dump_dest for your DB if you post the tail end of the file into the forum then we can see what is happening and try to sort out what the issue actually is