Oppia Install error

(oppia-env) MacBook-Pro-de-MACBOOK:oppia rachmann$ bash scripts/start.sh
Checking if node.js is installed in /Users/rachmann/Documents/open_source/oppia_tools
Unable to find 'python'. Trying python2.7 instead...
Generating list of installed node modules...
Generation completed.
Checking whether Google App Engine is installed in /Users/rachmann/Documents/open_source/oppia_tools/google_appengine_1.9.67/google_appengine
Checking whether google-cloud-sdk is installed in /Users/rachmann/Documents/open_source/oppia_tools/google-cloud-sdk-222.0.0/google-cloud-sdk
Environment setup completed.
Installing third-party JS libraries and zip files.
Downloading file yuicompressor-2.4.8.jar to ../oppia_tools/yuicompressor-2.4.8 ...
Traceback (most recent call last):
  File "scripts/install_third_party.py", line 351, in <module>
    _install_third_party_libs()
  File "scripts/install_third_party.py", line 338, in _install_third_party_libs
    download_manifest_files(MANIFEST_FILE_PATH)
  File "scripts/install_third_party.py", line 298, in download_manifest_files
    download_files(dependency_url, dependency_dst, dependency_files)
  File "scripts/install_third_party.py", line 99, in download_files
    filename=os.path.join(target_dir, filename))
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 98, in urlretrieve
    return opener.retrieve(url, filename, reporthook, data)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 245, in retrieve
    fp = self.open(url, data)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 213, in open
    return getattr(self, name)(url)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 443, in open_https
    h.endheaders(data)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 997, in endheaders
    self._send_output(message_body)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 850, in _send_output
    self.send(msg)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 812, in send
    self.connect()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 1212, in connect
    server_hostname=server_hostname)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py", line 350, in wrap_socket
    _context=self)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py", line 566, in __init__
    self.do_handshake()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py", line 788, in do_handshake
    self._sslobj.do_handshake()
IOError: [Errno socket error] [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:581)
(oppia-env) MacBook-Pro-de-MACBOOK:oppia rachmann$ bash scripts/start.sh