facebook prophet – I tried a lot of attempts to add the monthly seasonality of Propet, but I can’t. How do I fix it?

m = Prophet(changepoint_prior_scale=0.5,
future = m.make_future_dataframe(periods=300, freq='5min')
m.add_seasonality(name='monthly', period=30.5, fourier_order=5)
fcst = m.predict(future)
fig = m.plot(fcst)
fig = m.plot_components(fcst)

I have followed the official Propet manual, but it is hard to add the code below..

m.add_seasonality(name='monthly', period=30.5, fourier_order=5)

I get the following error…

670 if self.history is not None:
671 raise Exception(
–> 672 ‘Seasonality must be added prior to model fitting.’)
673 if name not in (‘daily’, ‘weekly’, ‘yearly’):
674 # Allow overwriting built-in seasonalities

Exception: Seasonality must be added prior to model fitting.

I am a beginner and I am studying hard.
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