Calendar import problem

Hello, i use this guide for migration to Carbonio CE - https://docs.zextras.com/carbonio/html/postinstall/migration.html.

But i have error, when i try import calendar file(instead some_name and some_domain i use real account and domain):

echo "prov sa some_name@some_domain.local postRestURL '/Calendar?fmt=ics' /opt/zextras/backup/some_name@some_domain.local.ics" | carbonio
prov> prov sa some_name@some_domain.local postRestURL '/Calendar?fmt=ics' /opt/zextras/backup/some_name@some_domain.local.ics
usage:  searchAccounts(sa) [-v] {ldap-query} [limit {limit}] [offset {offset}] [sortBy {attr}] [sortAscending 0|1*] [domain {domain}]

I'm newbie in carbonio mail server, and don't understand, which syntax i need to use.

Thanks for help