Transperant Data Encryption issue with database startup

Hi, I am trying to implemete TDE in oracle databse and have create encryption successfully too.
All the steps went on fine and encryption is working successfully.
now, I have an issue everytime when database shutdown and startup.
for which I have created a procedure to open the wallet and a trigger to open the wallet on DB startup.
here is the example : tde_proc.sql
1 create or replace procedure open_wallet
2 as
3 wallet_open exception;
4 pragma exception_init(wallet_open,-28354);
5 v_stmt varchar2(100);
6 v_password varchar2(20);
7 begin
8 v_password:='abcdef1' ;
9 -- edit the following line to store your secret wallet password
10 v_stmt :='ALTER SYSTEM SET ENCRYPTION WALLET OPEN IDENTIFIED BY "'||v_password||'"';
11 execute immediate v_stmt ;
12 exception
13 when wallet_open then
14 null;
15 end;
16 /
@wrap iname=tde_proc.sql
Processing tde_proc.sql to tde_proc.plb
SQL> @tde_proc.plb
Procedure created.
TRIGGER :
create or replace trigger open_tde_wallet
after startup on database
begin
-- call wrapped pl/sql pocedure
open_wallet;
end open_tde_wallet;
SQL> @open_wal.trg
Trigger created.
when I startup the database, alert log is showing the below error.
Errors in file /opt/oracle10/admin/bmp10/udump/bmp10_ora_18396.trc:
ORA-00604: error occurred at recursive SQL level 1
ORA-28353: failed to open wallet
ORA-06512: at "SYS.OPEN_WALLET", line 11
ORA-06512: at line 3
Thu Jul 23 17:36:41 2009
Completed: ALTER DATABASE OPEN
Please give me some solution to resolve the issue.

Hi..
Thanks for your reply.
1. yes variable v_password and wallet passwords are same. I had double checked after reading your reply. variable pwd
and encryption wallet passwords are same.
2. the entryof ENCRYPTION_WALLET_LOCATION in the SQLNET.ORA is also added.
here is the sqlnet.ora
ENCRYPTION_WALLET_LOCATION =
(SOURCE =
(METHOD = FILE)
(METHOD_DATA =
(DIRECTORY = /opt/oracle10/admin/tstbmp10/encrypt)
Thanks,
Krishna

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