Pylance Error - Cannot instantiate abstract class

"""
The error you're encountering is due to attempting to instantiate the `SimpleMovingAverage` class directly, which is not recommended as it is likely an abstract class. Instead, you should use the `SMA` helper method provided by the `QCAlgorithm` class. This method will create a `SimpleMovingAverage` object and handle its setup and updates automatically.

Here's how you can modify your code:

Replace the line:
```python
self._ma = IndicatorExtensions.of(SimpleMovingAverage(self.band_length), self._rsi)

With:

self._ma = self.sma(self.symbol, self.band_length)

If you need to use IndicatorExtensions.of, ensure that you are using it correctly with a custom indicator or another compatible indicator object. The SMA method will automatically handle the creation and updating of the SimpleMovingAverage for a given symbol and period.

Here's an example of how to use the SMA method in your algorithm:

class MyAlgorithm(QCAlgorithm):
    def initialize(self):
        self.set_start_date(2020, 1, 1)
        self.set_end_date(2020, 12, 31)
        self.symbol = self.add_equity("SPY", Resolution.DAILY).symbol
        self.band_length = 20
        self._ma = self.sma(self.symbol, self.band_length)

    def on_data(self, data):
        if self._ma.is_ready:
            self.debug(f"SMA value: {self._ma.current.value}")

This approach ensures that the SimpleMovingAverage is instantiated and updated correctly within the QuantConnect framework. """

Sources: Simple Moving Average - QuantConnect.com, Indicator Extensions S M A With Custom Indicators Regression Algorithm, Custom Indicator With Extension Algorithm, Automatic Indicators - QuantConnect.com, Combining Indicators - QuantConnect.com

Thanks AI, but your code replacement doesn't work for my case of combining indicators.  In future please check your code suggestion against the quantconnect API. 

Hi Chris

Maybe you can first try to remove 

from QuantConnect.Indicators import *

since it might overwrite the Python-wrapped indicator.

If it does not work, please provide the fully related code snippets for further investigation.

Best
Louis