unicode error

ryan@ryan-VirtualBox:~/ch4$ cat loadbalancer.yml
---
- name: write load balancer config file
  hosts: web
  gather_facts: True

  tasks:

  - name: Gather data for host and display
    debug: msg="For your host {{ inventory_hostname }}, the IP address is {{ ansible_enp0s3.ipv4.address }}. We'll add this to the load balancer config."

  - name: Generate config file
    template: src=lbconfig.j2 dest="~/ch4/configs/loadbalancer.cfg"

--


ryan@ryan-VirtualBox:~/ch4$ cat templates/lbconfig.j2
# Load balancer config file
name web-backend
{% for host in groups.web %}
server {{ host.inventory_hostname }} {{ host.ansible_enp0s3.ipv4.address }}:80
{% endfor %}

ryan@ryan-VirtualBox:~/ch4$ cat inventory
testhost ansible_ssh_host=127.0.0.1 ansible_ssh_user=ryan ansible_ssh_pass=lab
testhost2 ansible_ssh_host=127.0.0.1 ansible_ssh_user=ryan ansible_ssh_pass=lab
testhost3 ansible_ssh_host=127.0.0.1 ansible_ssh_user=ryan ansible_ssh_pass=lab

[web]
testhost
testhost2
testhost3


ERROR:

ansible-playbook loadbalancer.yml -i inventory

PLAY [write load balancer config file] *********************************************************************************************************************************************************************

TASK [Gathering Facts] *************************************************************************************************************************************************************************************
ok: [testhost]
ok: [testhost3]
ok: [testhost2]

TASK [Gather data for host and display] ********************************************************************************************************************************************************************
ok: [testhost] => {
    "msg": "For your host testhost, the IP address is 10.0.2.15. We'll add this to the load balancer config."
}
ok: [testhost2] => {
    "msg": "For your host testhost2, the IP address is 10.0.2.15. We'll add this to the load balancer config."
}
ok: [testhost3] => {
    "msg": "For your host testhost3, the IP address is 10.0.2.15. We'll add this to the load balancer config."
}

TASK [Generate config file] ********************************************************************************************************************************************************************************
fatal: [testhost3]: FAILED! => {"changed": false, "failed": true, "msg": "AnsibleUndefinedVariable: 'unicode object' has no attribute 'ansible_enp0s3'"}
fatal: [testhost2]: FAILED! => {"changed": false, "failed": true, "msg": "AnsibleUndefinedVariable: 'unicode object' has no attribute 'ansible_enp0s3'"}
fatal: [testhost]: FAILED! => {"changed": false, "failed": true, "msg": "AnsibleUndefinedVariable: 'unicode object' has no attribute 'ansible_enp0s3'"}
	to retry, use: --limit @/home/ryan/ch4/loadbalancer.retry

PLAY RECAP *************************************************************************************************************************************************************************************************
testhost                   : ok=2    changed=0    unreachable=0    failed=1
testhost2                  : ok=2    changed=0    unreachable=0    failed=1
testhost3                  : ok=2    changed=0    unreachable=0    failed=1