"smac" strategy not working

[avrenli2]

Hello,
I tried running the smac strategy's optimization tool, but it returns an error message:

from fastquant import get_stock_data, backtest
df = get_stock_data("TSLA", "2018-01-01", "2024-01-01")
opt = backtest("smac", df, fast_period=range(2,20), slow_period=range(2,30))

Error message:

ValueError                                Traceback (most recent call last)
[<ipython-input-14-f4fb58717c23>](https://localhost:8080/#) in <cell line: 1>()
----> 1 opt = ft.backtest("smac", df, fast_period=range(2,20), slow_period=range(2,30))

[/usr/local/lib/python3.10/dist-packages/fastquant/backtest/backtest.py](https://localhost:8080/#) in backtest(strategy, data, commission, init_cash, plot, fractional, slippage, single_position, verbose, sort_by, sentiments, strats, return_history, return_plot, channel, symbol, allow_short, short_max, figsize, multi_line_indicators, data_class, data_kwargs, plot_kwargs, fig, **kwargs)
    243                 print("=============================================")
    244                 print("Plotting backtest for optimal parameters ...")
--> 245             _, fig = backtest(
    246                 strategy,
    247                 data,

ValueError: too many values to unpack (expected 2)

You can also see my Google Colab notebook [here](https://colab.research.google.com/drive/16TXojnk_VNzfE8tV0D2hLorldFXHzZRr?usp=sharing)