Error installing wazo C4 engine for the first time

Hi everyone, I am a new user who would like to install wazo c4 to test and learn.
I have followed the initial indications of the page: / use-cases / class-4

I have installed a machine for each element and generated the following configuration file following the instructions:

#primer intento con wazo c4
sbc_1 ansible_ssh_host= ansible_ssh_port=22
sbc_2 ansible_ssh_host= ansible_ssh_port=22

router_1 ansible_ssh_host= ansible_ssh_port=22
router_2 ansible_ssh_host= ansible_ssh_port=22

rtpengine_1 ansible_ssh_host= ansible_ssh_port=22
rtpengine_2 ansible_ssh_host= ansible_ssh_port=22

database_1 ansible_ssh_host= ansible_ssh_port=22

redis_1 ansible_ssh_host= ansible_ssh_port=22








postgresql_listen_addresses = *

router_api_db_host =
router_api_redis_host =
router_dburl_dialog = redis [at]

sbc_advertise_address =
sbc_dispatcher_list = “1 sip: 16 10\n1 sip: 16 10”
sbc_dburl_dialog = redis [at]

sbc_advertise_address =
sbc_advertise_port = 5060

sbc_advertise_address =
sbc_advertise_port = 5060

rtpengine_public_address =

rtpengine_public_address =

wazo_distribution = pelican-buster
wazo_distribution_upgrade = pelican-buster

and when executing the installation it gives me the following errors:

ansible-playbook -i inventories/c4 c4.yml

[WARNING]: * Failed to parse /root/wazo-ansible/inventories/c4 with yaml plugin: Syntax Error while loading YAML.
did not find expected The error appears to have been in ‘/root/wazo-ansible/inventories/c4’: line
3, column 1, but may be elsewhere in the file depending on the exact syntax problem. The offending line appears to
be: [sbc_host] sbc_1 ansible_ssh_host= ansible_ssh_port=22 ^ here

[WARNING]: * Failed to parse /root/wazo-ansible/inventories/c4 with ini plugin: /root/wazo-
ansible/inventories/c4:71: Expected key=value host variable assignment, got:

[WARNING]: Unable to parse /root/wazo-ansible/inventories/c4 as an inventory source

[WARNING]: No inventory was parsed, only implicit localhost is available

[WARNING]: provided hosts list is empty, only localhost is available. Note that the implicit localhost does not
match ‘all’

PLAY [all] **********************************************************************************************************
skipping: no hosts matched

PLAY [database,router_api] ******************************************************************************************

TASK [Gathering Facts] **********************************************************************************************
fatal: [database_1]: UNREACHABLE! => {“changed”: false, “msg”: “Failed to connect to the host via ssh: root [at] Permission denied (publickey,password).”, “unreachable”: true}
fatal: [router_1]: UNREACHABLE! => {“changed”: false, “msg”: “Failed to connect to the host via ssh: root [at] Permission denied (publickey,password).”, “unreachable”: true}
fatal: [router_2]: UNREACHABLE! => {“changed”: false, “msg”: “Failed to connect to the host via ssh: root [at] Permission denied (publickey,password).”, “unreachable”: true}
to retry, use: --limit [at] /root/wazo-ansible/c4.retry

PLAY RECAP **********************************************************************************************************
database_1 : ok=0 changed=0 unreachable=1 failed=0
router_1 : ok=0 changed=0 unreachable=1 failed=0
router_2 : ok=0 changed=0 unreachable=1 failed=0


I guess I am missing some steps, please help me with what I would be missing or a link with more detailed instructions.