SQL ERROR

Error 6550 calling procedure:

ORA-06550: line 4, column 3:
PLS-00201: identifier 'WWW.USC' must be declared
ORA-06550: line 4, column 3:
PL/SQL: Statement ignored

The last SQL statement executed was:

begin
  HTP.HTBUF_LEN := 63;
  hades_util.set_before_webdb;
  www.usc.es;
  commit;
end;