Oracle : Ошибка ORA-01211

"Oracle7 data file is not from migration to Oracle8"
*Cause: The file is not a copy of the file LAST used under Oracle7. This
datafile is either a backup taken from before the migration, or
the database was opened by Oracle7 after the migration utility was
run. When converting a database from Oracle7 to Oracle8, the migration
program MUST be the LAST utility to access the database under Oracle7.
Only the datafiles that were current when the migration was done
may be accessed by Oracle8.
*Action: Have operating system make correct data file available to database,
or repeat the Oracle7 to Oracle8 migration. Make sure that
database is NOT opened after migration utility is run.

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