Can`t create calendars with Cyrus 3.2.6 on Debian 11

I'm trying to activate caldav and carddav with the following entries in imapd.conf.


configdirectory: /var/lib/cyrus
proc_path: /run/cyrus/proc
mboxname_lockpath: /run/cyrus/lock
defaultpartition: default
partition-default: /var/spool/cyrus/mail
partition-news: /var/spool/cyrus/news
newsspool: /var/spool/news
altnamespace: no
unixhierarchysep: no
lmtp_downcase_rcpt: yes
admins: cyrus
lmtp_admins: postman
allowanonymouslogin: no
popminpoll: 1
autocreate_quota: 0
umask: 077
sieveusehomedir: false
sievedir: /var/spool/sieve
httpmodules: caldav carddav
caldav_allowscheduling: on
caldav_create_default: 1
caldav_create_attach: 1
caldav_create_sched: 1
calendarprefix: #calendars
caldav_allowcalendaradmin: 1
hashimapspool: true
allowplaintext: yes
virtdomains: userid
defaultdomain: mydomain.local
sasl_pwcheck_method: saslauthd auxprop pwcheck
sasl_auxprop_plugin: sasldb
sasl_auto_transition: no
tls_client_ca_dir: /etc/ssl/certs
tls_session_timeout: 1440
lmtpsocket: /run/cyrus/socket/lmtp
idlesocket: /run/cyrus/socket/idle
notifysocket: /run/cyrus/socket/notify
syslog_prefix: cyrus

However no #calendars are created an when restarting cyrus-imapd I get error messager from
cyrexpire:
IOERROR: opening index user.<username>.#calendars: System I/O error
unable to open mailbox user.<username>.#calendars: System I/O error
IOERROR: opening index user.<username>.#calendars.Default: System I/O error
unable to open mailbox user.<username>.#calendars.Default: System I/O error

Whats going wrong?




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