freeradius-mysql crash on freeradius startup

/etc/freeradius/3.0/mods-enabled/sql file is:

sql {
        dialect = "mysql"
        driver = "rlm_sql_${dialect}"

        server = "localhost"
        port = 3306
        login = "radius"
        password = "XXXXXXXXXXXXXXXXX"

        radius_db = "radius"

        acct_table1 = "radacct"
        acct_table2 = "radacct"

        postauth_table = "radpostauth"

        authcheck_table = "radcheck"
        groupcheck_table = "radgroupcheck"

        authreply_table = "radreply"
        groupreply_table = "radgroupreply"

        usergroup_table = "radusergroup"

        delete_stale_sessions = yes

        pool {
                start = ${thread[pool].start_servers}
                min = ${thread[pool].min_spare_servers}
                max = ${thread[pool].max_servers}
                spare = ${thread[pool].max_spare_servers}
                uses = 0
                retry_delay = 30
                lifetime = 0
                idle_timeout = 60
        }

        read_clients = yes
        client_table = "nas"

        group_attribute = "SQL-Group"

        $INCLUDE ${modconfdir}/${.:name}/main/${dialect}/queries.conf
}