Error in running turbine_cluster_modelchain_example.ipynb

[zhp66]

File /srv/conda/envs/notebook/lib/python3.10/site-packages/windpowerlib/power_curves.py:143, in smooth_power_curve(power_curve_wind_speeds, power_curve_values, block_width, wind_speed_range, standard_deviation_method, mean_gauss, **kwargs)
141 maximum_value = power_curve_wind_speeds.iloc[-1] + wind_speed_range
142 while power_curve_wind_speeds.values[-1] < maximum_value:
--> 143 power_curve_wind_speeds = power_curve_wind_speeds.append(
144 pd.Series(
145 power_curve_wind_speeds.iloc[-1]
146 + (
147 power_curve_wind_speeds.iloc[5]
148 - power_curve_wind_speeds.iloc[4]
149 ),
150 index=[power_curve_wind_speeds.index[-1] + 1],
151 )
152 )
153 power_curve_values = power_curve_values.append(
154 pd.Series(0.0, index=[power_curve_values.index[-1] + 1])
155 )
156 for power_curve_wind_speed in power_curve_wind_speeds:
157 # Create array of wind speeds for the sum

File /srv/conda/envs/notebook/lib/python3.10/site-packages/pandas/core/generic.py:5989, in NDFrame.getattr(self, name)
5982 if (
5983 name not in self._internal_names_set
5984 and name not in self._metadata
5985 and name not in self._accessors
5986 and self._info_axis._can_hold_identifiers_and_holds_name(name)
5987 ):
5988 return self[name]
-> 5989 return object.getattribute(self, name)

AttributeError: 'Series' object has no attribute 'append'