Replication :: How To Remove Entry From Dba_repgroup

SELECT * FROM dba_repgroup;
returns a single row sname='VL_REPG', gname='VL_REPG', owner='PUBLIC'.

How do I get rid of it?

select * from dba_registered_mview_groups;
returns
no rows selected
select * from dba_objects where object_name = 'VL_REG';
returns
no rows selected

I triedSQL> l
1 BEGIN
2 dbms_repcat.comment_on_mview_repsites(gowner => 'PUBLIC', gname => 'VL_REPG', COMMENT => 'asdf');
3* END;
SQL> /
BEGIN
*
ERROR at line 1:
ORA-23314: database is not a materialized view site for "PUBLIC"."VL_REPG"
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 95
ORA-06512: at "SYS.DBMS_REPCAT_UTL", line 7376
ORA-06512: at "SYS.DBMS_REPCAT", line 509
ORA-06512: at line 2

how I get rid of this dba_repgroup.