AttributeError: 'str' object has no attribute 'size'

[En-J-A]

thank you for this work.

During train the model, I got this error

Traceback (most recent call last):
  File "/content/drive/MyDrive/MinTL/train.py", line 388, in <module>
    main()
  File "/content/drive/MyDrive/MinTL/train.py", line 377, in main
    m.train()
  File "/content/drive/MyDrive/MinTL/train.py", line 130, in train
    lm_labels=inputs["response"]
  File "/usr/local/lib/python3.7/dist-packages/torch/nn/modules/module.py", line 1051, in _call_impl
    return forward_call(*input, **kwargs)
  File "/content/drive/MyDrive/MinTL/T5.py", line 69, in forward
    head_mask=head_mask,
  File "/usr/local/lib/python3.7/dist-packages/torch/nn/modules/module.py", line 1051, in _call_impl
    return forward_call(*input, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/transformers/models/t5/modeling_t5.py", line 924, in forward
    encoder_batch_size, encoder_sequence_length, _ = encoder_hidden_states.size()
AttributeError: 'str' object has no attribute 'size'

what can I do to solve it ? please