[Dovecot] file_dotlock_create(~/.dovecot.lda-dupes) failed: No such file or directory ...

[LE NORCY Arnaud]

Hello,

i get this message every time that a user has enabled the vacation 
script (into Horde webmail)  in my mail.err log file:

Dec 22 10:18:16 mailserver dovecot: deliver(user324): 
file_dotlock_create(~/.dovecot.lda-dupes) failed: No such file or directory

normally the reply is sent only once in the number of configured days.. 
but for all users the reply is sent every time...
the day variable is "ignored.." because the file "dovecot.lda-dupes" is 
not wrotten i think..



~# dpkg -l | grep dovecot
ii  dovecot-common                      1:1.2.15-4                   
secure mail server that supports mbox and maildir mailboxes
ii  dovecot-imapd                       1:1.2.15-4                   
secure IMAP server that supports mbox and maildir mailboxes
ii  dovecot-pop3d                       1:1.2.15-4                   
secure POP3 server that supports mbox and maildir mailboxes


dovecot.conf :

protocols = imap imaps pop3s managesieve
mail_location = maildir:/ext/spool/imap/%1Mu/%u
mail_uid = vmail
mail_gid = vmail


protocol lda {
     mail_plugins = quota sieves.fr
}

..
plugin {
..
     sieve_dir = /ext/spool/sieve/%1Mu/%u
     sieve = /ext/spool/sieve/%1Mu/%u/dovecot.sieve
}



rights are OK for user "vmail" in /ext/spool/sieve/%1Mu/%u/ ....;

for example :

/ext/spool/sieve/d/user324# ls -la
total 20
drwxr-x---  3 vmail vmail 4096 20 déc.  19:15 .
drwxr-x--- 43 vmail vmail 4096 17 nov.  10:14 ..
lrwxrwxrwx  1 vmail vmail   10 20 déc.  18:38 dovecot.sieve -> ingo.sieve
-rw-r-----  1 vmail vmail   65 20 déc.  19:15 dovecot.svbin
-rw-r-----  1 vmail vmail   88 20 déc.  18:38 ingo.sieve
drwxr-x---  2 vmail vmail 4096 20 déc.  18:38 tmp


any ideas?thanks

Arnaud,