Error running sqlmate - python 2.7 **kwargs

[filebe777]

[>] Finding targets for my mate, SQLmap

From cffi callback <function _verify_callback at 0x7f79deff8cf8>:
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/OpenSSL/SSL.py", line 309, in wrapper
_lib.X509_up_ref(x509)
AttributeError: 'module' object has no attribute 'X509_up_ref'
Traceback (most recent call last):
File "sqlmate", line 360, in
google(dork, number)
File "sqlmate", line 67, in google
r = requests.get(url)
File "/usr/local/lib/python2.7/dist-packages/requests/api.py", line 72, in get
return request('get', url, params=params, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/requests/api.py", line 58, in request
return session.request(method=method, url=url, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/requests/sessions.py", line 508, in request
resp = self.send(prep, **send_kwargs)
File "/usr/local/lib/python2.7/dist-packages/requests/sessions.py", line 618, in send
r = adapter.send(request, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/requests/adapters.py", line 519, in send
raise SSLError(e, request=request)
requests.exceptions.SSLError: ("bad handshake: Error([('SSL routines', 'ssl3_get_server_certificate', 'certificate verify failed')],)",)
root@kali:~/Desktop/sqlmate#