the readme example throws an Exception

I copied the example from the README exactly, I did not change anything except for modifying the API key , secret key and having the following setting:

IS_BACKTEST = True
IS_LIVE = False
symbol = "AAPL"
...

I am getting the following Exception:

```

Starting Portfolio Value: 100000.0
***** DATA NOTIF: DELAYED
xception in thread Thread-1:
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", line 932, in _bootstrap_inner
self.run()
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/alpaca_backtrader_api/alpacastore.py", line 414, in _t_candles
cdl = cdl.loc[
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/pandas/core/frame.py", line 5162, in dropna
raise KeyError(list(np.compress(check, subset)))
KeyError: ['high']

```

it seems that the data that is coming back from the Alpaca broker is not properly formatted
please assist in resolving this