Oracle Database Discussions

1-->Hi I exported data from oracle10 g by imp utility.on the same server
Now I want to import the dump file on the oracle 9i user.
when I give command on linux server
c:\> imp username/password@oracle9i ..
It will give mi error as

UDI-00008: operation generated ORACLE error 6550
ORA-06550: line 1, column 52:
PLS-00201: identifier 'SYS.DBMS_DATAPUMP' must be declared
ORA-06550: line 1, column 52:
PL/SQL: Statement ignored

Can you tell mi what is this error ?

2-->After that I tried to export data of oracle10g user from oracle 9i exp utility
but in some tables it give mi error as
. . exporting table QRTZ_JOB_DETAILS
EXP-00003: no storage definition found for segment(17, 31315)
.
whts the error ?

3-How Can I create the replica of schema from oracle10g to oracle 9i.?