Why cannot drop user?

Hi all, I try it:
SQL>connect / as sysdba
SQL> drop user zyk cascade;
drop user zyk cascade
*
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1 ORA-00942: table or view does not exist

I know system user had delete the user's access$ table

SQL> connect zyk/zyk
ERROR:

ORA-00604: error occurred at recursive SQL level 1
ORA-00942: table or view does not exist
ORA-06512: at line 5

That's the trc file:

Dump file e:\ora_prog\zyk\udump\zyk_ora_2368.trc Mon Jan 27 18:12:27 2003
ORACLE V9.2.0.1.0 - Production vsnsta=0
vsnsql=12 vsnxtr=3
Windows 2000 Version 5.0 Service Pack 3, CPU type 586 Oracle9i Release 9.2.0.1.0 - Production
JServer Release 9.2.0.1.0 - Production
Windows 2000 Version 5.0 Service Pack 3, CPU type 586 Instance name: zyk

Redo thread mounted by this instance: 1

Oracle process number: 12

Windows thread id: 2368, image: ORACLE.EXE

• SESSION ID9.7) 2003-01-27 18:12:27.000 Error in executing triggers on connect internal
• 2003-01-27 18:12:27.000 ksedmp: internal or fatal error ORA-00604: error occurred at recursive SQL level 1 ORA-00942: table or view does not exist ORA-06512: at line 5

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end Received on Tue Jan 28 2003 - 00:30:25 CST