Error while installing Stouts.backup (https://github.com/guilro/trellis-backup-role)

Stouts backup installation error.txt

TASK [Stouts.backup : Install duplicity] ***************************************
System info:
  Ansible 2.3.1.0; Vagrant 1.9.7; Linux
  Trellis at "Option to install WP-CLI packages"
---------------------------------------------------
MODULE FAILURE
Traceback (most recent call last):
  File "/tmp/ansible_it6scr/ansible_module_apt.py", line 239, in <module>
    from ansible.module_utils.urls import fetch_url
  File "/tmp/ansible_it6scr/ansible_modlib.zip/ansible/module_utils/urls.py",
line 153, in <module>
  File "/usr/lib/python2.7/dist-packages/urllib3/contrib/pyopenssl.py", line
54, in <module>
    import OpenSSL.SSL
  File "/usr/lib/python2.7/dist-packages/OpenSSL/__init__.py", line 8, in
<module>
    from OpenSSL import rand, crypto, SSL
  File "/usr/lib/python2.7/dist-packages/OpenSSL/SSL.py", line 118, in
<module>
    SSL_ST_INIT = _lib.SSL_ST_INIT
AttributeError: 'module' object has no attribute 'SSL_ST_INIT'

An exception occurred during task execution. To see the full traceback, use -vvv. The error was: AttributeError: 'module' object has no attribute 'SSL_ST_INIT'
fatal: [default]: FAILED! => {"changed": false, "failed": true, "module_stdout": "", "rc": 1}