@backtrader Thank you for your help. Yes, it was a data subscription issue. I only have a paper money account and did not want to open a real IB account yet. I also was not sure how to request delayed market data instead of live market data.
I found out that I am allowed to stream forex data as is, so for now I am using that.

Thanks again for your help.

I am having a problem when trying to send trade orders with backtrader. I looked for a similar problem here but could not find anything. I get a notification of "NOTSUBSCRIBED" and according to the documentation (https://www.backtrader.com/docu/live/ib/ib.html) it means that the program does not have the right permissions.

I am running the TWS platform with a paper money account and following the Global settings setup from this tutorial: https://medium.com/@danjrod/interactive-brokers-in-python-with-backtrader-23dea376b2fc
Where can I give permission to backtrader to interact with the TWS platform?

I am hoping that someone can point me in the right direction, and this could possibly have a simple solution. Thank you. The problem and code are pasted below:

When I simply run the tutorial script I get this output from the terminal:

TWS Time at connection:20190222 11:10:01 EST
***** DATA NOTIF: DELAYED
***** DATA NOTIF: NOTSUBSCRIBED

The code I am currently running is below, which may have been modified from the tutorial in minor ways (but both scripts behave the same way).

#!/usr/bin/env python
# -*- coding: utf-8; py-indent-offset:4 -*-
###############################################################################
#
# Copyright (C) 2018 Daniel Rodriguez
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
###############################################################################
from __future__ import (absolute_import, division, print_function,
                        unicode_literals)

import backtrader as bt


class St(bt.Strategy):
    def logdata(self):
        txt = []
        txt.append('{}'.format(len(self)))
        txt.append('{}'.format(self.data.datetime.datetime(0).isoformat()))
        txt.append('{:.2f}'.format(self.data.open[0]))
        txt.append('{:.2f}'.format(self.data.high[0]))
        txt.append('{:.2f}'.format(self.data.low[0]))
        txt.append('{:.2f}'.format(self.data.close[0]))
        txt.append('{:.2f}'.format(self.data.volume[0]))
        print(','.join(txt))

    data_live = False

    def notify_data(self, data, status, *args, **kwargs):
        print('*' * 5, 'DATA NOTIF:', data._getstatusname(status), *args)
        if status == data.LIVE:
            self.data_live = True

    def notify_order(self, order):
        if order.status == order.Completed:
            buysell = 'BUY ' if order.isbuy() else 'SELL'
            txt = '{} {}@{}'.format(buysell, order.executed.size,
                                    order.executed.price)
            print(txt)

    bought = 0
    sold = 0

    def next(self):
        self.logdata()
        if not self.data_live:
            return

        if not self.bought:
            self.bought = len(self)  # keep entry bar
            self.buy()
        elif not self.sold:
            if len(self) == (self.bought + 3):
                self.sell()


def run(args=None):
    cerebro = bt.Cerebro(stdstats=False)
    store = bt.stores.IBStore(port=7497)

    data = store.getdata(dataname='TWTR-STK-SMART-USD', timeframe=bt.TimeFrame.Ticks)
    cerebro.resampledata(data, timeframe=bt.TimeFrame.Seconds, compression=10)

    cerebro.broker = store.getbroker()

    cerebro.addstrategy(St)
    cerebro.run()


if __name__ == '__main__':
    run()