Prepared statement does not exist

Hi,

I am not sure if sending this to the right place. I did try to get the
answer from pgpool mailing list but no luck . Would appreciate if someone
can help here.

We are receving the following error in the postgres database logs:

2009-03-19 02:14:20 PDT [2547]: [79-1] LOG: duration: 0.039 ms statement:
RESET ALL
2009-03-19 02:14:20 PDT [2547]: [80-1] LOG: duration: 0.027 ms statement:
SET SESSION AUTHORIZATION DEFAULT
2009-03-19 02:14:20 PDT [2547]: [81-1] ERROR: prepared statement "S_1" does
not exist
2009-03-19 02:14:20 PDT [2547]: [82-1] STATEMENT: DEALLOCATE "S_1"
2009-03-19 02:14:20 PDT [2547]: [83-1] ERROR: prepared statement "S_4" does
not exist
2009-03-19 02:14:20 PDT [2547]: [84-1] STATEMENT: DEALLOCATE "S_4"

We receive this errors when we start connecting the java application
thorugh pgpool. What causes this problem and how can it be avoided?

Postgres version: 8.3.3
pgpool II: 2.0.1

Thanks & Regards,
Nimesh.