Impossible to launch playbook

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hello,
i can"t upload my files cause to ansible-playbook, error .I don’t think, why i’ve should have malware cause to create this problem.
in my inventory file I’ve wrote the ipv4 adress, and finally the error text is this following text:

 ansible-playbook -i ./ansible/inventory.ini ./ansible/playbookCinq.yml 
[WARNING]: provided hosts list is empty, only localhost is available. Note that the implicit localhost does not match 'all'
[ERROR]: Empty playbook, nothing to do: /home/alexandre/Documents/XXXX/ansible/playbookCinq.yml

and my inventory file is :

\[servers\]
ubuntu ansible_host=xx.xx.xx.xx ansible_user=root ansible_become_method=su ansible_become_user=root 

\[all:vars\]

ansible_python_interpreter=/usr/bin/python3

my ansible-playbook version is :

ansible-playbook --version
ansible-playbook [core 2.21.2]
  config file = /home/alexandre/Documents/XXXXXXX/ansible.cfg
  configured module search path = ['/home/alexandre/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/alexandre/.local/share/pipx/venvs/ansible/lib/python3.12/site-packages/ansible
  ansible collection location = /home/alexandre/.ansible/collections:/usr/share/ansible/collections
  executable location = /home/alexandre/.local/bin/ansible-playbook
  python version = 3.12.3 (main, Jun 19 2026, 12:46:00) [GCC 13.3.0] (/home/alexandre/.local/share/pipx/venvs/ansible/bin/python)
  jinja version = 3.1.6
  pyyaml version = 6.0.2 (with libyaml v0.2.5)

Regards