Dovecot IMAP & left menu missing folder

Berindeie Avram-Teodor via squirrelmail-users <[email protected]>
Newsgroups gmane.mail.squirrelmail.user
Message-ID <[email protected]>
My configuration:
Slackware64-current
postfix-3.2.2
dovecot-2.2.32
amavisd-new-2.11.0
httpd-2.4.27-x86_64
php-7.1.9
SquirrelMail version: 1.4.23 [SVN]
I can connect to Dovecot and Postfix from command line.
I have no error in SquirrelMail configtest.
I can connect to Squirrelmail and send/receive mail BUT my left menu are 
missing folders INBOX, Draft, Sent and Trash.
In apache log I have only two PHP notice:
[php7:notice] [pid ...][client ...] PHP Notice: Undefined offset: 1 in 
.../functions/imap_mailbox.php on line 45, referer:.../src/webmail.php
[php7:notice] [pid ...] [client ...] PHP Notice: Undefined index: EXISTS 
in .../functions/mailbox_display.php on line 439, referer: 
.../src/webmail.php

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