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 ORA-01460: unimplemented or unreasonable conversion requested

This error can have a number of causes.:

* You are using an Oracle client that does not know the database characterset used (eg. AL32UTF8 or WE8ISO8859P15)
* The tool you are using is not configured for the databases version (check the supplier)
* The client NLS_LANG does not match the database NLS_LANG