BUG #3555: does not work VACUUM

The following bug has been logged online:

Bug reference: 3555
Logged by: Dmitry
Email address: dd442(at)mail(dot)ru
PostgreSQL version: 8.1
Operating system: Linux Slackware 11
Description: does not work VACUUM
Details:

root(at)darkstar:~# su postgres
postgres(at)darkstar:/root$ postgres -D /var/lib/pgsql/data/ -P taxi
WARNING: database "baza" must be vacuumed within 976150 transactions
HINT: To avoid a database shutdown, execute a full-database VACUUM in
"baza".
WARNING: database "baza" must be vacuumed within 976150 transactions
HINT: To avoid a database shutdown, execute a full-database VACUUM in
"baza".

PostgreSQL stand-alone backend 8.1.5

backend>VACUUM;

WARNING: database "baza" must be vacuumed within 976005 transactions
HINT: To avoid a database shutdown, execute a full-database VACUUM in
"baza".
WARNING: database "baza" must be vacuumed within 976004 transactions
HINT: To avoid a database shutdown, execute a full-
[...]
WARNING: database "baza" must be vacuumed within 975895 transactions
HINT: To avoid a database shutdown, execute a full-database VACUUM in
"baza".
backend>

is not got use VACUUM, VACUUM FULL...

3 months PostgreSQL work together with 1C:Enterprice 8.1 server.

Prompt, how correct givenned mistake.

Thank you, Dmitry.