ORA-00942: table or view does not exist : How do I find which table or view it is talking about

create table caught_errors (
  dt        date,
  username  varchar2( 30), -- value from ora_login_user
  msg       varchar2(2000),
  stmt      varchar2(2000)
);


create or replace trigger catch_errors
   after servererror on database
declare
   sql_text ora_name_list_t;
   msg_     varchar2(2000) := null;
   stmt_    varchar2(2000) := null;
begin

  for depth in 1 .. ora_server_error_depth loop
    msg_ := msg_ || ora_server_error_msg(depth);
  end loop;

  for i in 1 .. ora_sql_txt(sql_text) loop
     stmt_ := stmt_ || sql_text(i);
  end loop;

  insert into
    caught_errors (dt     , username      ,msg ,stmt )
           values (sysdate, ora_login_user,msg_,stmt_);
end;
/