Demo: agent-kea6 doesn't work

There is an observed issue:

ERROR DHCP6_PARSER_FAIL failed to create or run parser for configuration element shared-networks: Failed to create pool defined by: 4001:db8:1:0:abcd::/64 (/etc/kea/kea-dhcp6.conf:390:42) (/etc/kea/kea-dhcp6.conf:383:9)
ERROR DHCP6_CONFIG_LOAD_FAIL configuration error using file: /etc/kea/kea-dhcp6.conf, reason: Failed to create pool defined by: 4001:db8:1:0:abcd::/64 (/etc/kea/kea-dhcp6.conf:390:42) (/etc/kea/kea-dhcp6.conf:383:9)
2023-09-07 11:21:27.539 ERROR [kea-dhcp6.dhcp6/109.140467203000768] DHCP6_INIT_FAIL failed to initialize Kea server: configuration error using file '/etc/kea/kea-dhcp6.conf': Failed to create pool defined by: 4001:db8:1:0:abcd::/64 (/etc/kea/kea-dhcp6.conf:390:42) (/etc/kea/kea-dhcp6.conf:383:9)
2023-09-07 11:21:27,540 INFO exited: kea-dhcp6 (exit status 1; not expected)