Expected behavior

This code should work fine.

Code sample

self.vol20 = self.I(talib.SMA, self.data.Volume, 20)
 self.vol50 = self.I(talib.SMA, self.data.Volume, 50)
 raise RuntimeError(f'Indicator "{name}" errored with exception: {e}')
 131 if isinstance(value, pd.DataFrame):
 132 value = value.values.T
RuntimeError: Indicator "SMA(V,20)" errored with exception: input array type is not double

Actual behavior

But I get the error above when I write it on GOOG

Additional info, steps to reproduce, full crash traceback, screenshots

No response

Software versions

• backtesting.__version__: 0.3.3
• pandas.__version__: 2.3.3
• numpy.__version__: 1.24.3
• talib.__version__: 0.6.7
• OS: windows