Urgent help please! IMAP can't work after use ispconfig_update.sh upgrade

I upgrade my ISPconfig from 3.0.16 to 3.0.22
http://www.faqforge.com/linux/controlpanels/ispconfig3/how-to-update-ispconfig-3/

Now the Dovecot can't start. all services down, Please help !
THANK YOU !!!!!!!!!

Starting Dovecot Imap: Error: Error in configuration file /etc/dovecot.conf line 715: Unknown protocol name (section changed in /etc/dovecot.conf at line 709)
Fatal: Invalid configuration in /etc/dovecot.conf
[FAILED]


Line 709 to Line 715 dovecot.conf


protocol managesieve {
# Login executable location.
#login_executable = /usr/libexec/dovecot/managesieve-login

# ManageSieve executable location. See IMAP's mail_executable above for
# examples how this could be changed.
#mail_executable = /usr/libexec/dovecot/managesieve

# Maximum ManageSieve command line length in bytes. This setting is
# directly borrowed from IMAP. But, since long command lines are very
# unlikely with ManageSieve, changing this will not be very useful.
#managesieve_max_line_length = 65536

# ManageSieve logout format string:
# %i - total number of bytes read from client
# %o - total number of bytes sent to client
#managesieve_logout_format = bytes=%i/%o

# If, for some inobvious reason, the sieve_storage remains unset, the
# ManageSieve daemon uses the specification of the mail_location to find out
# where to store the sieve files (see explaination in README.managesieve).
# The example below, when uncommented, overrides any global mail_location
# specification and stores all the scripts in '~/mail/sieve' if sieve_storage
# is unset. However, you should always use the sieve_storage setting.
# mail_location = mbox:~/mail

# To fool ManageSieve clients that are focused on timesieved you can
# specify the IMPLEMENTATION capability that the dovecot reports to clients
# (default: "dovecot").
#managesieve_implementation_string = Cyrus timsieved v2.2.13
}

 

Upgrade dovecot.conf

 

backup dovecot.conf

 

If I remark Line 709 to Line 715 of dovecot.conf
The Dovecot can start.

But when use SquirrelMail login.

ERROR:
ERROR: Connection dropped by IMAP server.
Query: CAPABILITY


message log

Sep 13 18:19:27 mail dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=::ffff:192.168.0.11, lip=::ffff:192.168.0.3
Sep 13 18:19:27 mail dovecot: IMAP([email protected]): Ambiguous mail location setting, don't know what to do with it: /var/vmail/vinnitsa.com.hk/it/Maildir (try prefixing it with mbox: or maildir
Sep 13 18:19:27 mail dovecot: IMAP([email protected]): Mail storage creation failed with mail_location: /var/vmail/user.com/user/Maildir
Sep 13 18:19:27 mail dovecot: child 12356 (imap) returned error 89

 

Anyone can give me a hand ?
THANK YOU VERY MUCH !!!!!!!

 

Please add managesieve to the protocols line (line 20) and restart Dovecot.