It works fine if I use 'load_from_tsfile_to_dataframe' utility but fails when I use 'load_from_arff_to_dataframe' This is how the dataset is downloaded c:\myfolder\ECG200 c:\myfolder\ECG200\ECG200_TEST.arff c:\myfolder\ECG200\ECG200_TEST.ts c:\myfolder\ECG200\ECG200_TEST.txt ...