Export and import from oracle 9i enterprise to Oracle 10g express

Hi,
I am trying to export data from Oracle 9i enterprise edition using (exp)
server\BIN> exp usr/pwd file=emp.dmp full=yes
then I copied emp.dmp file to Oracle 10g express (....\server\BIN) another system using network (shared)
server\BIN> imp usr/pwd file=emp.dmp full=yes
got an error and contents of log file :

Connected to: Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
Export file created by EXPORT:V09.02.00 via conventional path
import done in WE8MSWIN1252 character set and AL16UTF16 NCHAR character set
import server uses AL32UTF8 character set (possible charset conversion)
. importing SYSTEM's objects into SYSTEM
IMP-00017: following statement failed with ORACLE error 1119:
 "CREATE UNDO TABLESPACE "UNDOTBS1" BLOCKSIZE 8192 DATAFILE  'D:\ORACLE\ORADA"
 "TA\JERDEV\UNDOTBS01.DBF' SIZE 959447040       AUTOEXTEND ON NEXT 5242880  M"
 "AXSIZE 32767M EXTENT MANAGEMENT LOCAL "
....
....
IMP-00015: following statement failed because the object already exists:
 "CREATE SEQUENCE "WM$LOCK_SEQUENCE" MINVALUE 1 MAXVALUE 99999999999999999999"
 "9999999 INCREMENT BY 2 START WITH 4 NOCACHE NOORDER NOCYCLE"
. importing WKSYS's objects into WKSYS
 "ALTER SESSION SET CURRENT_SCHEMA= "WKSYS""
IMP-00003: ORACLE error 1435 encountered
ORA-01435: user does not exist
IMP-00000: Import terminated unsuccessfully

Its really urgent please

advance thanx,
Radhakrishna