while importing schema level import,i got the following error,

IMP-00017: following statement failed with ORACLE error 1:
"BEGIN DBMS_JOB.ISUBMIT(JOB=>190,WHAT=>'dbms_mview.refresh(''MVIEW_CONTACT"
"_SUMMARY'',''C'');',NEXT_DATE=>TO_DATE('4000-01-01:00:00:00','YYYY-MM-DD:HH"
"24:MI:SS'),INTERVAL=>'null',NO_PARSE=>TRUE); END;"
IMP-00003: ORACLE error 1 encountered
ORA-00001: unique constraint (SYS.I_JOB_JOB) violated
ORA-06512: at "SYS.DBMS_JOB", line 97
ORA-06512: at line 1


What i've to do get rid of this error?