python-slack-sdk: Slack Login Error in rtm_connect

I am following this tutorial here: https://www.fullstackpython.com/blog/build-first-slack-bot-python.html and I am having a problem when I am trying to run the code. The errors I get are:

Traceback (most recent call last): File “C:\Users\n0342338\AppData\Local\Programs\Python\Python36\lib\site-packages\slackclient\client.py”, line 52, in rtm_connect self.server.rtm_connect(use_rtm_start=with_team_state, **kwargs) File “C:\Users\n0342338\AppData\Local\Programs\Python\Python36\lib\site-packages\slackclient\server.py”, line 151, in rtm_connect raise SlackLoginError(reply=reply) slackclient.server.SlackLoginError

The code is never entering the ‘if slack_client.rtm_connect(with_team_state=False)’ statement.

Here is the code:

slack_token = os.environ['SLACK_BOT_TOKEN']
slack_client = SlackClient(slack_token)

#slack_client = SlackClient(os.environ.get('SLACK_BOT_TOKEN'))
# starterbot's user ID in slack: Value is assigned after the bot starts up
startbot_id = None

#constants
RTM_READ_DELAY = 1 #This is a 1 second RTM_READ_DELAY
EXAMPLE_COMMAND = "do"
MENTION_REGEX = "^@(|[WU].+?)>(.*)"
print('at beggining')
def parse_bot_commands(slack_events):
    """
        Parses a list of event coming from the Slack RTM API to find bot commands.
        If a bot command is found, this function returns a tuple of command and channel.
        If it is not found, then this function returns None, None.
    """
    for event in slack_events:
        if event["type"] == "message" and not "subtype" in event:
            user_id, message = parse_direct_mention(event["text"])
            if user_id == starterbot_id:
                return message, event["channel"]
    return None, None

def parse_direct_mention(message_text):
    """
        Finds a direct mention (a mention that is at the begginging) in message message
        and returns the user ID which was mentioned. If there is no direct mention
        it returns None
    """
    matches = re.search(MENTION_REGEX, message_text)
    #The first group contains the username, the second groups contains the
    #remaining message return (matches.group(1), matches.group(2).strip()) if
    #matches else (None, None)

def handle_command(command, channel):
    """
        Executes bot command if the command is known
    """
    #Default response is help text for the user
    default_response = "Not sure what you mean. Try *{}*.".format(EXAMPLE_COMMAND)

    #Finds and executes the given command, filling in response
    response = None

    #Other commands implement there
    if command.startwith(EXAMPLE_COMMAND):
        response = "Sure...write stuff here"

    #Sends the response back to the channel
    print('before api call')
    slack_client.api_call(
        "chat.postMessage",
        channel=channel,
        text=respones or default_response
        )
print('at name=main')
if __name__ == "__main__":
    print('in name = mian')
    if slack_client.rtm_connect(with_team_state=False):
        print("Starter Bot connected and running!")
        #Read bot's user ID by calling Web API method 'auth.test'
        print('here')
        starterbot_id = slack_client.api_call("auth_test")["user_id"]
        while True:
            command, channel = parse_bot_commands(slack_client.rtm_read())
            if command:
                handle_command(command, channel)
            time.sleep(RTM_READ_DELAY)
        else:
            print("Connection failed. Exception taceback printed above")