impdp ORA-00001: unique constraint (SYS.I_JOB_JOB) violated

impdp system/******** directory=DUMP_DIR_TEST dumpfile=czyjpxdb1113.dmp logfile=czyjpxdb1113.log schemas=mgrdb,accdb,txndb,comdb,czyjdb,rpt,stldb remap_tablespace=TBS_CZKDATA:TBS_CZYJDATA1
报错：
ORA-39083: Object type JOB failed to create with error:
ORA-00001: unique constraint (SYS.I_JOB_JOB) violated
Failing sql is:
 BEGIN SYS.DBMS_IJOB.SUBMIT( JOB=> 23, LUSER=> 'CZYJDB', PUSER=> 'CZYJDB', CUSER=> 'CZYJDB', NEXT_DATE=> TO_DATE('2014-11-13 22:03:45', 'YYYY-MM-DD:HH24:MI:SS'), INTERVAL=> 'SYSDATE + 120/1440  ', BROKEN=>  FALSE, WHAT=> 'dbms_refresh.refresh(''"CZYJDB"."MV_TBL_CARD_ACCOUNT"'');', NLSENV=> 'NLS_LANGUAGE=''AMERICAN'' NLS_TERRITORY=''AMERICA'' NLS_CURRENCY=''$'' NLS_ISO_CURRENCY=''AMER