An error occurs during compilation: certificate verify failed

[Legolaz7]

flet version = 0.26
the folder was created with the flet create command
There was no such error before

I entered the command flet build apk and the following error appears:

flet build apk
(    ● ) Installing Flutter 3.27.3...
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/urllib/request.py", line 1344, in do_open
    h.request(req.get_method(), req.selector, req.data, headers,
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/http/client.py", line 1336, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/http/client.py", line 1382, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/http/client.py", line 1331, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/http/client.py", line 1091, in _send_output
    self.send(msg)
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/http/client.py", line 1035, in send
    self.connect()
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/http/client.py", line 1477, in connect
    self.sock = self._context.wrap_socket(self.sock,
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/ssl.py", line 455, in wrap_socket
    return self.sslsocket_class._create(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/ssl.py", line 1042, in _create
    self.do_handshake()
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/ssl.py", line 1320, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1000)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/legoaz/PycharmProjects/Bonus/.venv/bin/flet", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/Users/legoaz/PycharmProjects/Bonus/.venv/lib/python3.12/site-packages/flet/cli.py", line 11, in main
    flet_cli.cli.main()
  File "/Users/legoaz/PycharmProjects/Bonus/.venv/lib/python3.12/site-packages/flet_cli/cli.py", line 89, in main
    args.handler(args)
  File "/Users/legoaz/PycharmProjects/Bonus/.venv/lib/python3.12/site-packages/flet_cli/commands/build.py", line 555, in handle
    self.initialize_build()
  File "/Users/legoaz/PycharmProjects/Bonus/.venv/lib/python3.12/site-packages/flet_cli/commands/build.py", line 622, in initialize_build
    self.install_flutter()
  File "/Users/legoaz/PycharmProjects/Bonus/.venv/lib/python3.12/site-packages/flet_cli/commands/build.py", line 678, in install_flutter
    flutter_dir = install_flutter(
                  ^^^^^^^^^^^^^^^^
  File "/Users/legoaz/PycharmProjects/Bonus/.venv/lib/python3.12/site-packages/flet_cli/utils/flutter.py", line 41, in install_flutter
    download_with_progress(url, archive_path, progress=progress)
  File "/Users/legoaz/PycharmProjects/Bonus/.venv/lib/python3.12/site-packages/flet_cli/utils/distros.py", line 12, in download_with_progress
    with urllib.request.urlopen(url) as response:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/urllib/request.py", line 215, in urlopen
    return opener.open(url, data, timeout)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/urllib/request.py", line 515, in open
    response = self._open(req, data)
               ^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/urllib/request.py", line 532, in _open
    result = self._call_chain(self.handle_open, protocol, protocol +
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/urllib/request.py", line 492, in _call_chain
    result = func(*args)
             ^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/urllib/request.py", line 1392, in https_open
    return self.do_open(http.client.HTTPSConnection, req,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/urllib/request.py", line 1347, 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:1000)>

[ndonkoHenri]

Did you happen to fix the issue?

[FeodorFitsner]

To me it looks like a python network-related issue, most probably a firewall or VPN or other "middle main" tinkering with certificates.