# Buggy code
def main(sysargv: List[str] = None) -> None:
    """
    This function will initiate the bot and start the trading loop.
    :return: None
    """

    return_code: Any = 1
    try:
        arguments = Arguments(sysargv)
        args = arguments.get_parsed_arg()

        # Call subcommand.
        if "func" in args:
            return_code = args["func"](args)
        else:
            # No subcommand was issued.
            raise OperationalException(
                "Usage of Freqtrade requires a subcommand to be specified.\n"
                "To have the previous behavior (bot executing trades in live/dry-run modes, "
                "depending on the value of the `dry_run` setting in the config), run freqtrade "
                "as `freqtrade trade [options...]`.\n"
                "To see the full list of options available, please use "
                "`freqtrade --help` or `freqtrade <command> --help`."
            )

    except SystemExit as e:
        return_code = e
    except KeyboardInterrupt:
        logger.info("SIGINT received, aborting ...")
        return_code = 0
    except FreqtradeException as e:
        logger.error(str(e))
        return_code = 2
    except Exception:
        logger.exception("Fatal exception!")
    finally:
        sys.exit(return_code)


# Traceback (Exception)
2020-02-20 22:47:28,025 - freqtrade - ERROR - Fatal exception!
Traceback (most recent call last):
File "/opt/tradebot/freqtrade/.env/lib/python3.7/site-packages/talib/__init__.py", line 20, in wrapper
for arg in chain(args, kwargs.values())
StopIteration

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/freqtrade/freqtrade/main.py", line 36, in main
return_code = args['func'](args)
File "/freqtrade/freqtrade/commands/optimize_commands.py", line 76, in start_hyperopt
hyperopt.start()
File "/freqtrade/freqtrade/optimize/hyperopt.py", line 488, in start
preprocessed = self.backtesting.strategy.tickerdata_to_dataframe(data)
File "/freqtrade/freqtrade/strategy/interface.py", line 448, in tickerdata_to_dataframe
for pair, pair_data in tickerdata.items()}
File "/freqtrade/freqtrade/strategy/interface.py", line 448, in <dictcomp>
for pair, pair_data in tickerdata.items()}
File "/freqtrade/freqtrade/strategy/interface.py", line 464, in advise_indicators
return self.populate_indicators(dataframe, metadata)
File "/freqtrade/user_data/strategies/MyDev.py", line 205, in populate_indicators
dataframe['mfi'] = ta.MFI(dataframe)
File "talib/_abstract.pxi", line 352, in talib._ta_lib.Function.__call__
File "talib/_abstract.pxi", line 383, in talib._ta_lib.Function.__call_function
File "/opt/tradebot/freqtrade/.env/lib/python3.7/site-packages/talib/__init__.py", line 24, in wrapper
return func(*args, **kwargs)
File "talib/_func.pxi", line 8454, in talib._ta_lib.MFI
Exception: volume is not double

# Fixed code
def main(sysargv: List[str] = None) -> None:
    """
    This function will initiate the bot and start the trading loop.
    :return: None
    """

    return_code: Any = 1
    try:
        arguments = Arguments(sysargv)
        args = arguments.get_parsed_arg()

        # Call subcommand.
        if "func" in args:
            return_code = args["func"](args)
        else:
            # No subcommand was issued.
            raise OperationalException(
                "Usage of Freqtrade requires a subcommand to be specified.\n"
                "To have the bot executing trades in live/dry-run modes, "
                "depending on the value of the `dry_run` setting in the config, run Freqtrade "
                "as `freqtrade trade [options...]`.\n"
                "To see the full list of options available, please use "
                "`freqtrade --help` or `freqtrade <command> --help`."
            )

    except SystemExit as e:
        return_code = e
    except KeyboardInterrupt:
        logger.info("SIGINT received, aborting ...")
        return_code = 0
    except FreqtradeException as e:
        logger.error(str(e))
        return_code = 2
    except Exception:
        logger.exception("Fatal exception!")
    finally:
        sys.exit(return_code)