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SQL-02120:

First and second arguments to SQLRCN both null
Cause: Both the first and second arguments to sqlrcn were null. An HSTDEF must be passed into SQLRCN in either the form of an OCI lda (first argument) or as an HSTDEF pointer itself (second argument).
Action: Pass in either an OCI LDA or an HSTDEF, but not both. *Note: This error *msg* is never actually used. The error *number* is used, given as the return value of sqlrcn if this error occurs.