pre-training question ! how can i tackle this problems

[ereeere123]

C:\Users\47307\Desktop\MGCA-main>C:/Users/47307/anaconda3/envs/mgca/python.exe c:/Users/47307/Desktop/MGCA-main/mgca/models/backbones/encoder.py
Freezing BERT model
Traceback (most recent call last):
File "c:/Users/47307/Desktop/MGCA-main/mgca/models/backbones/encoder.py", line 464, in
report_feat, sent_feat, sent_mask, sents = model(
File "C:\Users\47307\anaconda3\envs\mgca\lib\site-packages\torch\nn\modules\module.py", line 1518, in _wrapped_call_impl
return self._call_impl(*args, **kwargs)
File "C:\Users\47307\anaconda3\envs\mgca\lib\site-packages\torch\nn\modules\module.py", line 1527, in _call_impl
return forward_call(*args, **kwargs)
File "c:/Users/47307/Desktop/MGCA-main/mgca/models/backbones/encoder.py", line 382, in forward
last_layer_attn = outputs.attentions[-1][:, :, 0, 1:].mean(dim=1)
TypeError: 'NoneType' object is not subscriptable