Erreur: ansible nécessite un module json, aucun trouvé

D'erreur lors de l'exécution d'ansible ping module

bash ~ ansible webservers  -i inventory -m ping  -k  -u root -vvvv
SSH password: 
<~> ESTABLISH CONNECTION FOR USER: root on PORT 22 TO ~
<my-lnx> ESTABLISH CONNECTION FOR USER: root on PORT 22 TO my-lnx
~ | FAILED => FAILED: [Errno 8] nodename nor servname provided, or not known
<my-lnx> REMOTE_MODULE ping
<my-lnx> EXEC /bin/sh -c 'mkdir -p $HOME/.ansible/tmp/ansible-tmp-1423302966.66-77716810353582 && echo $HOME/.ansible/tmp/ansible-tmp-1423302966.66-77716810353582'
<my-lnx> PUT /var/folders/8n/fftvnbbs51q834y16vfvb1q00000gn/T/tmpP6zwZj TO /root/.ansible/tmp/ansible-tmp-1423302966.66-77716810353582/ping
<my-lnx> EXEC /bin/sh -c 'LANG=en_US.UTF-8 LC_CTYPE=en_US.UTF-8 /usr/bin/python /root/.ansible/tmp/ansible-tmp-1423302966.66-77716810353582/ping; rm -rf /root/.ansible/tmp/ansible-tmp-1423302966.66-77716810353582/>/dev/null 2>&1'
my-lnx | FAILED >> {
    "failed": true, 
    "msg": "Error: ansible requires a json module, none found!", 
    "parsed": false
}

C'est mon fichier d'inventaire de

bash ~ cat inventory 
[webservers]
my-lnx  ansible_ssh_host=my-lnx ansible_ssh_port=22

J'ai installé simplejosn module dans le client ainsi que la machine distante

bash ~ pip list | grep json
simple-json (1.1)
simplejson (3.6.5)

source d'informationauteur anish | 2015-02-07