Error while Droping Undo Tablespace.

Hi,
I come across following error while droping UNDO tablesapce-
ORA-01548: active rollback segment '_SYSSMU1$' found, terminate dropping tablespace
Before droping above tablespace I created a new tablespace and set UNDO_TABLESPACE=<new Tablespace>.
I even tried to drop the UNDO tablespace after restarting instance, but no vail.
Any workaround?
Thanks,

the problem's details :
SVRMGR> select segment_name,status,tablespace_name from dba_rollback_segs where
status='NEEDS RECOVERY';
SEGMENT_NAME STATUS TABLESPACE_NAME
OKRBS NEEDS RECOVERY TS_OKRBS
1 row selected.
SVRMGR> drop rollback segment OKRBS;
drop rollback segment OKRBS
ORA-01545: rollback segment 'OKRBS' specified not available
SVRMGR> select segment_name,status,tablespace_name from dba_rollback_segs;
SEGMENT_NAME STATUS TABLESPACE_NAME
SYSTEM ONLINE SYSTEM
RBS0 ONLINE RBS
RBS1 ONLINE RBS
RBS2 ONLINE RBS
RBS3 ONLINE RBS
RBS4 ONLINE RBS
RBS5 ONLINE RBS
RBS6 ONLINE RBS
ASTEK_RBS1 ONLINE TS_ROLLBKS
ASTEK_RBS2 ONLINE TS_ROLLBKS
ASTEK_RBS3 ONLINE TS_ROLLBKS
OKRBS NEEDS RECOVERY TS_OKRBS
12 rows selected.
SVRMGR> select file_name,TABLESPACE_NAME,status from dba_data_files;
FILE_NAME
TABLESPACE_NAME STATUS
/home/oracle/oradata/wil7/drsys01.dbf
DRSYS AVAILABLE
/home/oracle/oradata/wil7/indx01.dbf
INDX AVAILABLE
/home/oracle/oradata/wil7/users01.dbf
USERS AVAILABLE
/home/oracle/oradata/wil7/temp01.dbf
TEMP AVAILABLE
/home/oracle/oradata/wil7/rbs01.dbf
RBS AVAILABLE
/home/oracle/oradata/wil7/tools01.dbf
TOOLS AVAILABLE
/home/oracle/oradata/wil7/system01.dbf
SYSTEM AVAILABLE
/data1/oradata/907/INDEKS01.ORA
TS_INDEKS AVAILABLE
/data1/oradata/907/INDEKS02.ORA
TS_INDEKS AVAILABLE
/data2/oradata/907/IURAN01.ORA
TS_IURAN AVAILABLE
/data2/oradata/907/IURAN02.ORA
TS_IURAN AVAILABLE
/data2/oradata/907/JURNAL01.ORA
TS_JURNAL AVAILABLE
/data2/oradata/907/DATAPDK01.ORA
TS_PDK AVAILABLE
/data2/oradata/907/ROLLBKS01.ORA
TS_ROLLBKS AVAILABLE
/data1/oradata/907/SIMKJ01.ORA
TS_SIMKJ AVAILABLE
/data1/oradata/907/SIMKJ02.ORA
TS_SIMKJ AVAILABLE
/data2/oradata/907/TMPSIMKJ01.ORA
TS_TMPSIMKJ AVAILABLE
/data2/oradata/907/TMPSIMKJ02.ORA
TS_TMPSIMKJ AVAILABLE
/data2/oradata/907/UPAH01.ORA
TS_UPAH AVAILABLE
/data1/oradata/907/GLDATA01.ORA
TSGL_DATA AVAILABLE
/data1/oradata/907/GLBACKUP01.ORA
TSGL_BACKUP AVAILABLE
/data1/oradata/907/GLINDEX01.ORA
TSGL_INDEX AVAILABLE
/data2/oradata/907/SDM01.ORA
TS_PERSONALIA AVAILABLE
/data2/oradata/907/SDMIND01.ORA
TS_PERSOIND AVAILABLE
/data2/oradata/907/SDMPDK01.ORA
TS_PERSOPDK AVAILABLE
/data2/oradata/907/SDMROLL01.ORA
TS_PERSOROLL AVAILABLE
/data2/oradata/907/SDMTEMP01.ORA
TS_PERSOTEMP AVAILABLE
/data6/analisa/ANALISA.ORA
TS_ANALISA AVAILABLE
/data4/TS_OKTMP.ORA
TS_OKTMP AVAILABLE
/home/oracle/oradata/wil7/system02.dbf
SYSTEM AVAILABLE
/data4/TS_OKRBS.ORA
TS_OKRBS AVAILABLE
/data4/TS_OKIDX.ORA
TS_OKIDX AVAILABLE
/data5/TS_OKDTA1.ORA
TS_OKDTA AVAILABLE
/data5/TS_ODSSNP1.ORA
TS_ODSSNP AVAILABLE
/data6/TS_ODSSNP2.ORA
TS_ODSSNP AVAILABLE
/data6/TS_OKDTA2.ORA
TS_OKDTA AVAILABLE
/data2/oradata/907/ROLLBK02.ORA
TS_ROLLBKS AVAILABLE
/data1/oradata/907/SIMKJ03.ORA
TS_SIMKJ AVAILABLE
/data1/oradata/907/INVEN01.ORA
TS_INVEN AVAILABLE
/data2/oradata/907/INVENIND01.ORA
TS_INVENIND AVAILABLE
/data1/oradata/907/INVENTEMP01.ORA
TS_INVENTEMP AVAILABLE
/data1/oradata/907/GLBACKUP02.ORA
TSGL_BACKUP AVAILABLE
/data2/oradata/907/DATAPDK02.ORA
TS_PDK AVAILABLE
/data2/tssipa_data01.ora
TSSIPA_DATA AVAILABLE
/data2/tssipa_index01.ora
TSSIPA_INDEX AVAILABLE
/data2/tssipa_tmp01.ora
TSSIPA_TMP AVAILABLE
/data2/tssipa_backup01.ora
TSSIPA_BACKUP AVAILABLE
/data1/oradata/907/GLDATA02.ORA
TSGL_DATA AVAILABLE
/data1/oradata/907/GLINDEX02.ORA
TSGL_INDEX AVAILABLE
/data2/tsdpkp_data01.ora
TSDPKP_DATA AVAILABLE
/data2/tsdpkp_index01.ora
TSDPKP_INDEX AVAILABLE
/data2/TSKBL_DATA.ora
TSKBL_DATA AVAILABLE
/data2/TSKBL_INDEX.ora
TSKBL_INDEX AVAILABLE
/data2/TSKBL_BACKUP.ora
TSKBL_BACKUP AVAILABLE
/data2/SILHKDATA01.ORA
TS_SILHK_DATA AVAILABLE
/data2/SILHKINDEX01.ORA
TS_SILHK_INDEX AVAILABLE
/data2/SILHKPDK01.ORA
TS_SILHK_PDK AVAILABLE
/data2/tsdpkp_backup01.ora
TSDPKP_BACKUP AVAILABLE
58 rows selected.
SVRMGR>

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