Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 699, in urlopen
    httplib_response = self._make_request(
  File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 382, in _make_request
    self._validate_conn(conn)
  File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 1012, in _validate_conn
    conn.connect()
  File "/usr/lib/python3/dist-packages/urllib3/connection.py", line 411, in connect
    self.sock = ssl_wrap_socket(
  File "/usr/lib/python3/dist-packages/urllib3/util/ssl_.py", line 449, in ssl_wrap_socket
    ssl_sock = _ssl_wrap_socket_impl(
  File "/usr/lib/python3/dist-packages/urllib3/util/ssl_.py", line 493, in _ssl_wrap_socket_impl
    return ssl_context.wrap_socket(sock, server_hostname=server_hostname)
  File "/usr/lib/python3.9/ssl.py", line 500, in wrap_socket
    return self.sslsocket_class._create(
  File "/usr/lib/python3.9/ssl.py", line 1040, in _create
    self.do_handshake()
  File "/usr/lib/python3.9/ssl.py", line 1309, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLCertVerificationError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired (_ssl.c:1123)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/requests/adapters.py", line 439, in send
    resp = conn.urlopen(
  File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 755, in urlopen
    retries = retries.increment(
  File "/usr/lib/python3/dist-packages/urllib3/util/retry.py", line 574, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='talks.w.icmp.camp', port=443): Max retries exceeded with url: /api/events/wicmp1 (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired (_ssl.c:1123)')))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/voc/schedule/voc/pretalx.py", line 27, in __init__
    self['meta'] = self.meta()
  File "/home/voc/schedule/voc/pretalx.py", line 34, in meta
    return requests.get(self.api_url, timeout=1) \
  File "/usr/lib/python3/dist-packages/requests/api.py", line 76, in get
    return request('get', url, params=params, **kwargs)
  File "/usr/lib/python3/dist-packages/requests/api.py", line 61, in request
    return session.request(method=method, url=url, **kwargs)
  File "/usr/lib/python3/dist-packages/requests/sessions.py", line 542, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/lib/python3/dist-packages/requests/sessions.py", line 655, in send
    r = adapter.send(request, **kwargs)
  File "/usr/lib/python3/dist-packages/requests/adapters.py", line 514, in send
    raise SSLError(e, request=request)
requests.exceptions.SSLError: HTTPSConnectionPool(host='talks.w.icmp.camp', port=443): Max retries exceeded with url: /api/events/wicmp1 (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: certificate has expired (_ssl.c:1123)')))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/voc/schedule/schedule_jev22.py", line 89, in <module>
    PretalxConference(
  File "/home/voc/schedule/voc/pretalx.py", line 30, in __init__
    logger.warning(e)
AttributeError: module 'voc.logger' has no attribute 'warning'
Traceback (most recent call last):
  File "/home/voc/schedule/validate_rC3.py", line 78, in <module>
    sys.exit(main())
  File "/home/voc/schedule/validate_rC3.py", line 74, in main
    return check_roomnames(args.channels_url, args.streamconfig_url, args.i)
  File "/home/voc/schedule/validate_rC3.py", line 30, in check_roomnames
    for channel in channels['data']['channels']:
KeyError: 'channels'