Error setting up Let's Encrypt using debian 9

Hi Everyone,

I have a problem installing Let’s Encrypt on Debian 9 - Apache server:

here’s my error code:

Traceback (most recent call last):
  File "/usr/bin/certbot", line 11, in <module>
    load_entry_point('certbot==0.10.2', 'console_scripts', 'certbot')()
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 561, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2631, in load_entry_point
    return ep.load()
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2291, in load
    return self.resolve()
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2297, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/usr/lib/python2.7/dist-packages/certbot/main.py", line 13, in <module>
    from acme import jose
  File "/usr/lib/python2.7/dist-packages/acme/jose/__init__.py", line 37, in <module>
    from acme.jose.interfaces import JSONDeSerializable
  File "/usr/lib/python2.7/dist-packages/acme/jose/interfaces.py", line 9, in <module>
    from acme.jose import util
  File "/usr/lib/python2.7/dist-packages/acme/jose/util.py", line 5, in <module>
    import OpenSSL
  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 124, in <module>
    SSL_ST_INIT = _lib.SSL_ST_INIT
AttributeError: 'module' object has no attribute 'SSL_ST_INIT'

Hope you can help me.

Thanks!