# Buggy code
def startup_messages(self, config, pairlist) -> None:
    if config["dry_run"]:
        self.send_msg(
            {
                "type": RPCMessageType.WARNING_NOTIFICATION,
                "status": "Dry run is enabled. All trades are simulated.",
            }
        )
    stake_currency = config["stake_currency"]
    stake_amount = config["stake_amount"]
    minimal_roi = config["minimal_roi"]
    stoploss = config["stoploss"]
    trailing_stop = config["trailing_stop"]
    ticker_interval = config["ticker_interval"]
    exchange_name = config["exchange"]["name"]
    strategy_name = config.get("strategy", "")
    self.send_msg(
        {
            "type": RPCMessageType.CUSTOM_NOTIFICATION,
            "status": f"*Exchange:* `{exchange_name}`\n"
            f"*Stake per trade:* `{stake_amount} {stake_currency}`\n"
            f"*Minimum ROI:* `{minimal_roi}`\n"
            f"*{'Trailing ' if trailing_stop else ''}Stoploss:* `{stoploss}`\n"
            f"*Ticker Interval:* `{ticker_interval}`\n"
            f"*Strategy:* `{strategy_name}`",
        }
    )
    self.send_msg(
        {
            "type": RPCMessageType.STATUS_NOTIFICATION,
            "status": f"Searching for {stake_currency} pairs to buy and sell "
            f"based on {pairlist.short_desc()}",
        }
    )


# 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 startup_messages(self, config: Dict[str, Any], pairlist) -> None:
    if config["dry_run"]:
        self.send_msg(
            {
                "type": RPCMessageType.WARNING_NOTIFICATION,
                "status": "Dry run is enabled. All trades are simulated.",
            }
        )
    stake_currency = config["stake_currency"]
    stake_amount = config["stake_amount"]
    minimal_roi = config["minimal_roi"]
    stoploss = config["stoploss"]
    trailing_stop = config["trailing_stop"]
    ticker_interval = config["ticker_interval"]
    exchange_name = config["exchange"]["name"]
    strategy_name = config.get("strategy", "")
    self.send_msg(
        {
            "type": RPCMessageType.CUSTOM_NOTIFICATION,
            "status": f"*Exchange:* `{exchange_name}`\n"
            f"*Stake per trade:* `{stake_amount} {stake_currency}`\n"
            f"*Minimum ROI:* `{minimal_roi}`\n"
            f"*{'Trailing ' if trailing_stop else ''}Stoploss:* `{stoploss}`\n"
            f"*Ticker Interval:* `{ticker_interval}`\n"
            f"*Strategy:* `{strategy_name}`",
        }
    )
    self.send_msg(
        {
            "type": RPCMessageType.STATUS_NOTIFICATION,
            "status": f"Searching for {stake_currency} pairs to buy and sell "
            f"based on {pairlist.short_desc()}",
        }
    )