I'm getting this error 'SSL: CERTIFICATE_VERFIY_FAILED '

I'm getting an 'SSL: CERTIFICATE_VERFIY_FAILED' error when I run my code. I have included my code and the full error message. Thanks! This is my code:

from urllib.request import urlopen
from bs4 import BeautifulSoup

import re


def internal_links(linkURL):
    html = urlopen('https://treehouse-projects.github.io/horse-land/{}'.format(linkURL))
    soup = BeautifulSoup(html.read(), 'html.parser')

    return soup.find('a', href=re.compile('(.html)$'))


if __name__ == '__main__':
    urls = internal_links('index.html')

    while len(urls) > 0:
        page = urls.attrs['href']

        print(page)
        print('/n==============================/n')
        urls = internal_links(page)

And this is the error: Traceback (most recent call last): File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 1317, in do_open encode_chunked=req.has_header('Transfer-encoding')) File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/http/client.py", line 1229, in request self._send_request(method, url, body, headers, encode_chunked) File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/http/client.py", line 1275, in _send_request self.endheaders(body, encode_chunked=encode_chunked) File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/http/client.py", line 1224, in endheaders self._send_output(message_body, encode_chunked=encode_chunked) File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/http/client.py", line 1016, in _send_output self.send(msg) File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/http/client.py", line 956, in send self.connect() File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/http/client.py", line 1392, in connect server_hostname=server_hostname) File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/ssl.py", line 412, in wrap_socket session=session File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/ssl.py", line 853, in _create self.do_handshake() File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/ssl.py", line 1117, in do_handshake self._sslobj.do_handshake() ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1056)

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "/Users/mohamedahmed/Documents/Coding/Learning/Treehouse/Python/web_scraping/soup_follow_scraper.py", line 15, in <module> urls = internal_links('indexl.html') File "/Users/mohamedahmed/Documents/Coding/Learning/Treehouse/Python/web_scraping/soup_follow_scraper.py", line 8, in internal_links html = urlopen('https://treehouse-projects.github.io/horse-land/{}'.format(linkURL)) File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 222, in urlopen return opener.open(url, data, timeout) File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 525, in open response = self._open(req, data) File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 543, in _open '_open', req) File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 503, in _call_chain result = func(*args) File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 1360, in https_open context=self._context, check_hostname=self._check_hostname) File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/urllib/request.py", line 1319, in do_open raise URLError(err) urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1056)>

Process finished with exit code 1