AttributeError: module 'lib' has no attribute 'X509V3_EXT_get'

Question

running ubuntu 18.10
python version 3.6.7
flask
flask-ask

trying to test my alexa skill via Ngrok before deployment but I keep running into an error when I go to launch my flask python file. I launches fine:
$ python main.py

• Running on http://127.0.0.1:8080/ (Press CTRL+C to quit)
• Restarting with stat
• Debugger is active!
• Debugger PIN: 161-386-650

once in the alexa devolper console when I try to activate the skill I get this error

127.0.0.1 - - [02/Apr/2019 18:22:55] "POST / HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1997, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1985, in wsgi_app
    response = self.handle_exception(e)
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1540, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/b/.local/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/b/.local/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/b/.local/lib/python3.6/site-packages/flask_ask/core.py", line 728, in _flask_view_func
    ask_payload = self._alexa_request(verify=self.ask_verify_requests)
  File "/home/b/.local/lib/python3.6/site-packages/flask_ask/core.py", line 662, in _alexa_request
    cert = verifier.load_certificate(cert_url)
  File "/home/b/.local/lib/python3.6/site-packages/flask_ask/verifier.py", line 21, in load_certificate
    if not _valid_certificate(cert):
  File "/home/b/.local/lib/python3.6/site-packages/flask_ask/verifier.py", line 63, in _valid_certificate
    value = str(extension)
  File "/home/b/.local/lib/python3.6/site-packages/OpenSSL/crypto.py", line 779, in __str__
    return self._subjectAltNameString()
  File "/home/b/.local/lib/python3.6/site-packages/OpenSSL/crypto.py", line 740, in _subjectAltNameString
    method = _lib.X509V3_EXT_get(self._extension)
AttributeError: module 'lib' has no attribute 'X509V3_EXT_get'
127.0.0.1 - - [02/Apr/2019 18:22:57] "POST / HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1997, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1985, in wsgi_app
    response = self.handle_exception(e)
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1540, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/b/.local/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1614, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1517, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/b/.local/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
    raise value
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/b/.local/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/b/.local/lib/python3.6/site-packages/flask_ask/core.py", line 728, in _flask_view_func
    ask_payload = self._alexa_request(verify=self.ask_verify_requests)
  File "/home/b/.local/lib/python3.6/site-packages/flask_ask/core.py", line 662, in _alexa_request
    cert = verifier.load_certificate(cert_url)
  File "/home/b/.local/lib/python3.6/site-packages/flask_ask/verifier.py", line 21, in load_certificate
    if not _valid_certificate(cert):
  File "/home/b/.local/lib/python3.6/site-packages/flask_ask/verifier.py", line 63, in _valid_certificate
    value = str(extension)
  File "/home/b/.local/lib/python3.6/site-packages/OpenSSL/crypto.py", line 779, in __str__
    return self._subjectAltNameString()
  File "/home/b/.local/lib/python3.6/site-packages/OpenSSL/crypto.py", line 740, in _subjectAltNameString
    method = _lib.X509V3_EXT_get(self._extension)
AttributeError: module 'lib' has no attribute 'X509V3_EXT_get'