error to run a train_aligner.py

[herokarimpoor]

hi
when i have a run a train_aligner.py i have a errora below.

Traceback (most recent call last):
File "train_aligner.py", line 137, in
test_mel, test_phonemes, _, test_fname = valid_dataset.next_batch()
File "/home/TTS/TransformerTTS-main/TransformerTTS-main/data/datasets.py", line 272, in next_batch
return next(self.data_iter)
File "/root/miniconda3/envs/ttsmain/lib/python3.8/site-packages/tensorflow/python/data/ops/iterator_ops.py", line 816, in next
raise StopIteration
StopIteration

path of dataset is attach