[horde] Problem with Horde "Mailbox does not support mod-sequences"

[Luca Bertoncello]

Zitat von Michael J Rubinsky <mrubinsk at horde.org>:

>> I just have this problem if I do something in the INBOX folder!
>> On other folder (sent, spam, and so on) the problem does not happen...
>
> Enable IMAP debug logging in IMP. See imp/config/backends.php

I tried it, but it does not log...
What have I to add?
I tried to add:

    'debug' => '/tmp/imp_imap.log'

in the section "$servers['imap']", but it does not work...

Thanks
Luca Bertoncello
(lucabert at lucabert.de)