list index out of range

[NLPgameplayer]

Run'nnUNetv2_predict -i /home/cz/model/nnUNet-master/DATASET/nnUNet_raw/nnUNet_raw_data/Task04_Hippocampus/imagesTs/ -o /home/cz/model/nnUNet-master/DATASET/nnUNet_raw/nnUNet_raw_data/Task04_Hippocampus/inferTs/ -d 4 -c 3d_fullres
'debug assertion failed：
There are 1 cases in the source folder
I am process 0 out of 1 (max process ID is 0, we start counting with 0!)
There are 0 cases that I would like to predict
Exception in background worker 0:
list index out of range
Traceback (most recent call last):
File "/home/cz/anaconda3/envs/nnUnet/lib/python3.9/site-packages/batchgenerators/dataloading/multi_threaded_augmenter.py", line 46, in producer
item = next(data_loader)
File "/home/cz/anaconda3/envs/nnUnet/lib/python3.9/site-packages/batchgenerators/dataloading/data_loader.py", line 126, in next
return self.generate_train_batch()
File "/home/cz/model/nnUNet-master/nnunetv2/inference/data_iterators.py", line 42, in generate_train_batch
files = self._data[idx][0]
IndexError: list index out of range
using pin_memory on device 0
Traceback (most recent call last):
File "/home/cz/anaconda3/envs/nnUnet/bin/nnUNetv2_predict", line 33, in
sys.exit(load_entry_point('nnunetv2', 'console_scripts', 'nnUNetv2_predict')())
File "/home/cz/model/nnUNet-master/nnunetv2/inference/predict_from_raw_data.py", line 600, in predict_entry_point
r = predict_from_raw_data(args.i,
File "/home/cz/model/nnUNet-master/nnunetv2/inference/predict_from_raw_data.py", line 221, in predict_from_raw_data
return predict_from_data_iterator(data_iterator, network, parameters, plans_manager, configuration_manager, dataset_json,
File "/home/cz/model/nnUNet-master/nnunetv2/inference/predict_from_raw_data.py", line 250, in predict_from_data_iterator
for preprocessed in data_iterator:
File "/home/cz/anaconda3/envs/nnUnet/lib/python3.9/site-packages/batchgenerators/dataloading/multi_threaded_augmenter.py", line 204, in next
item = self.__get_next_item()
File "/home/cz/anaconda3/envs/nnUnet/lib/python3.9/site-packages/batchgenerators/dataloading/multi_threaded_augmenter.py", line 189, in __get_next_item
raise RuntimeError("One or more background workers are no longer alive. Exiting. Please check the "
RuntimeError: One or more background workers are no longer alive. Exiting. Please check the print statements above for the actual error message

what should I do？