Key error when using ensemble

[adalseno]

Hi, I tried the model (on Colab) and worked without any issue (not with good performances actually) until this point all_ensemble_in, all_ensemble_out, all_performance = am.ensemble(forecast_in, forecast_out) where it gives me the following error:

Building LightGBM Ensemble from TS data (ensemble_lgb)
Building LightGBM Ensemble from PCA reduced TSFresh Features (ensemble_ts). This can take a long time.
LightGBM ensemble have been successfully built
358  variables are found to be almost constant
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
<ipython-input-55-7e8add29e43a> in <module>()
----> 1 all_ensemble_in, all_ensemble_out, all_performance = am.ensemble(forecast_in, forecast_out)

6 frames
/usr/local/lib/python3.6/dist-packages/pandas/core/indexes/base.py in drop(self, labels, errors)
   5338         if mask.any():
   5339             if errors != "ignore":
-> 5340                 raise KeyError("{} not found in axis".format(labels[mask]))
   5341             indexer = indexer[~mask]
   5342         return self.delete(indexer)

KeyError: "['index'] not found in axis"

Here attached the df. The model is:
model_list = ['ARIMA',"HWAMS","HWAAS","TBATS1"]
am = AutomatedModel(df = df , model_list=model_list,forecast_len=65 )

df.csv.zip