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ORA-08468:

mask option string is not supported
Cause: The mask option <clause> was passed to a UTL_PG conversion routine, but is not supported by UTL_PG. The <clause> can be: USAGE IS POINTER USAGE IS INDEX USAGE IS COMP-1 USAGE IS COMP-2 POINTER
Action: Remove the <clause> from the mask options parameter in the PL/SQL call to UTL_PG.