Only valid with DatetimeIndex, TimedeltaIndex or PeriodIndex, but got an instance of 'Index'

[SuveerGoyal]

when I run the script generate_s2s_dataset, I get the error
Traceback (most recent call last):
File "D:\nilm_code\nilm_fcn-master\generate_s2s_dataset.py", line 234, in
= all_s2s_single_appliance(set_homes, appliance, sample_rate, receptive_field,
File "D:\nilm_code\nilm_fcn-master\generate_s2s_dataset.py", line 136, in all_s2s_single_appliance
data_arrays = home_s2s_multi_appliance(readings, [appliance], sampling_freq,
File "D:\nilm_code\nilm_fcn-master\generate_s2s_dataset.py", line 23, in home_s2s_multi_appliance
readings = readings.resample(freq_string).mean()
File "C:\Python39\lib\site-packages\pandas\core\generic.py", line 8369, in resample
return get_resampler(
File "C:\Python39\lib\site-packages\pandas\core\resample.py", line 1311, in get_resampler
return tg._get_resampler(obj, kind=kind)
File "C:\Python39\lib\site-packages\pandas\core\resample.py", line 1476, in _get_resampler
raise TypeError(
TypeError: Only valid with DatetimeIndex, TimedeltaIndex or PeriodIndex, but got an instance of 'Index'