[Dovecot] Sieve: unknown tagged argument ':create' for the fileinto command

[mail...@securitylabs.it]

Hello, I've upgraded from dovecot 1.2.x with sieve to dovecot 2.0.11 
with sieve. I've noticed that folders are no more created at delivery 
time now. I've read that I have to do two things:

lda_mailbox_autocreate = yes
in dovecot.conf

and fileinto :create in the sieve script. Now the error message I receive is:

error: unknown tagged argument ':create' for the fileinto command (reported 
only once at first occurence).

My sieve script:

require ["date", "variables", "fileinto"];
  if header :contains "subject" "Bacula:" {
    if currentdate :matches "month" "*" { set "month" "${1}"; }
    if currentdate :matches "year"  "*" { set "year"  "${1}"; }
    fileinto :create "INBOX.Bacula.${month}-${year}";
  } else {
  # The rest goes into INBOX
  # default is "implicit keep", we do it explicitly here
  keep;
}

My dovecot conf:

papua:/usr/local/bin# dovecot -n
# 2.0.11: /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-5-amd64 x86_64 Debian 6.0.1
auth_cache_negative_ttl = 2 mins
auth_cache_size = 1000 M
auth_cache_ttl = 2 mins
auth_mechanisms = plain cram-md5 apop
auth_username_chars = 
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@&
disable_plaintext_auth = no
first_valid_uid = 100
last_valid_uid = 105
lda_mailbox_autocreate = yes
lock_method = dotlock
log_timestamp = "%Y-%m-%d %H:%M:%S "
login_greeting = Server ready.
mail_fsync = never
mail_gid = Debian-exim
mail_location = maildir:~/Maildir
mail_privileged_group = Debian-exim
mail_uid = Debian-exim
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character 
vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy 
include variables body enotify environment mailbox date
namespace {
  inbox = yes
  location =
  prefix = INBOX.
  separator = .
  type = private
}
passdb {
  args = /usr/local/etc/dovecot-sql.conf
  driver = sql
}
plugin/mail_log_events = delete expunge
plugin/mail_log_group_events =
plugin/quota = maildir
plugin/quota_warning = storage=80%% /usr/local/bin/dovecot-quota-warning.sh 80
plugin/quota_warning2 = storage=90%% /usr/local/bin/dovecot-quota-warning.sh 90
plugin/sieve = ~/.dovecot.sieve
protocols = imap
service auth {
  unix_listener auth-userdb {
    group = Debian-exim
    mode = 0600
    user = Debian-exim
  }
}
service imap-login {
  client_limit = 256
  process_limit = 128
  process_min_avail = 3
  service_count = 1
}
service imap {
  drop_priv_before_exec = yes
  process_limit = 256
  vsz_limit = 256 M
}
service pop3-login {
  client_limit = 256
  process_limit = 128
  process_min_avail = 3
  service_count = 1
}
service pop3 {
  drop_priv_before_exec = yes
  process_limit = 256
  vsz_limit = 256 M
}
ssl_cert =</usr/local/etc/dovecot.crt
ssl_key =</usr/local/etc/dovecot.key
userdb {
  args = /usr/local/etc/dovecot-sql.conf
  driver = sql
}
protocol imap {
  mail_max_userip_connections = 10
  mail_plugins = " notify quota imap_quota mail_log"
}
protocol lda {
  mail_plugins = quota sieve
  postmaster_address = postmas...@me.com
}