tried to train but got this error at the end

1 +- 03_bill_mix.mp3 +- 03_bill_inst.mp3
2 +- 04_fasc_mix.mp3 +- 04_fasc_inst.mp3
3 +- 01_amd_mix.mp3 +- 01_amd_inst.mp3
4 +- 02_beat_mix.mp3 +- 02_beat_inst.mp3
0%| | 0/4 [00:00 warnings.warn('PySoundFile failed. Trying audioread instead.')
C:\Users\Robert\AppData\Local\Programs\Python\Pyth on37\lib\site-packages\librosa\core\audio.py:161: UserWarning: PySoundFile failed. Trying audioread instead.
warnings.warn('PySoundFile failed. Trying audioread instead.')
100%|█████████████████████████████████████████████ ███████████████████████████████████████| 4/4 [01:53<00:00, 28.25s/it]
0it [00:00, ?it/s]
# epoch 0
* inner epoch 0
Traceback (most recent call last):
File "train.py", line 223, in
main()
File "train.py", line 194, in main
X_train, y_train, model, optimizer, args.batchsize, instance_loss)
File "train.py", line 75, in train_inner_epoch
return sum_loss / len(X_train)
ZeroDivisionError: division by zero