Oracle Message ORA-08459 - invalid format parameter length

ERRORinvalid format parameter length
CAUSEThe format parameter passed to a UTL_PG conversion routine was not the correct length. Format parameters must be 2048 bytes in length.
ACTIONCheck to be sure that the format parameter was built by MAKE_RAW_TO_NUMBER_FORMAT or MAKE_NUMBER_TO_RAW_FORMAT, and that it was not accidentally overwritten or modified by the PL/SQL procedure.