load local model

[zhilonglu]

hello，when i try to run the QGwithAns code, I download the model from hugging face and save in the local path.
butu when load the model from local path, there is an error occur.
nlp = T5_QG.pipeline("question-generation", model='valhalla/t5-base-qg-hl', qg_format="highlight")
I change the model para above to local path like './Pretrained_Models/t5_base_qg_hl'
nlp = T5_QG.pipeline("question-generation", model='./Pretrained_Models/t5_base_qg_hl', qg_format="highlight")
but there is an error below.
│ 307 │ │ return _sentencepiece.SentencePieceProcessor_serialized_model │
│ 308 │ │
│ 309 │ def LoadFromFile(self, arg): │
│ ❱ 310 │ │ return _sentencepiece.SentencePieceProcessor_LoadFromFile(sel │
│ 311 │ │
│ 312 │ def _EncodeAsIds(self, text, enable_sampling, nbest_size, alpha, │
│ 313 │ │ return _sentencepiece.SentencePieceProcessor__EncodeAsIds(sel │
╰──────────────────────────────────────────────────────────────────────────────╯
TypeError: not a string

how to fix it?