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PCB-00206:

Cannot use N quoted literal in PL/SQL when NLS_LOCAL=YES
Cause: A "N" literal (a literal of the form N'...') was used within a PL/SQL block when the precompiler option NLS_LOCAL=YES was used. N literals are not supported in this situation.
Action: Use an ordinary literal (one without the "N") within the PL/SQL block or use precompiler option NLS_LOCAL=NO.