ORA-12663 and @connection.describe with Oracle7

I am trying to use Rails and an Oracle 7 database.

I have the following error message:
(eval):3:in __send__': ORA-12663: Services required by client not available on the server (OCIError) from (eval):3:indescribe’

and the line oracle_adapter,rb:361:
(owner, table_name) = @connection.describe(table_name)

Do I need this describe line?

Can I replace with something else just to get the query to work?

Thanks

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