Why am i getting “missing right parenthesis” error when i try to LOG ERRORS when loading from an external table?

I’ve successfully created an error logging table

BEGIN     DBMS_ERRLOG.create_error_log(     dml_table_name  => 'enzyme',     skip_unsupported => TRUE); END; /  desc ERR$  _ENZYME; 
Name            Null? Type            --------------- ----- --------------  ORA_ERR_NUMBER$         NUMBER          ORA_ERR_MESG$           VARCHAR2(2000)  ORA_ERR_ROWID$          UROWID          ORA_ERR_OPTYP$          VARCHAR2(2)     ORA_ERR_TAG$            VARCHAR2(2000)  ENZ_NAME              VARCHAR2(4000)  

But i get an error when I try to run this query:

insert /*+ ignore_row_on_dupkey_index ( enzyme ( enz_name ) ) */ into enzyme SELECT enz_name FROM EXTERNAL ((   construct_id NUMBER(10),   n_term VARCHAR2 (50),   enz_name VARCHAR2 (3),   c_term VARCHAR2 (50),   cpp VARCHAR2 (50),   mutations VARCHAR2 (50),   mw_kda NUMBER (7, 3))      TYPE ORACLE_LOADER     DEFAULT DIRECTORY data_to_input     ACCESS PARAMETERS (         RECORDS DELIMITED BY NEWLINE         skip 1         FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'         MISSING FIELD VALUES ARE NULL          )      LOCATION ('CONSTRUCT.CSV')     LOG ERRORS INTO ERR$  _ENZYME ('INSERT') REJECT LIMIT UNLIMITED) ext     where not exists (         select * from enzyme e         where e.enz_name = ext.enz_name     ); 
Error at Command Line : 79 Column : 5 Error report - SQL Error: ORA-00907: missing right parenthesis 00907. 00000 -  "missing right parenthesis" *Cause:     *Action: 

Line 79 is the LOG ERRORS INTO line.

If i delete the LOG ERRORS INTO ERR$ _ENZYME ('INSERT') part, this command functions perfectly.