老师您好，打扰您了，切换模型对话时，发现报这个错误，麻烦您帮忙看看，多谢

[2025-07-23 20:07:59,581.581] _internal.py -> _log line:97 [ERROR]: Error on request:

Traceback (most recent call last):

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/werkzeug/serving.py", line 370, in run_wsgi

    execute(self.server.app)

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/werkzeug/serving.py", line 333, in execute

    for data in application_iter:

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/werkzeug/wsgi.py", line 256, in __next__

    return self._next()

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/werkzeug/wrappers/response.py", line 32, in _iter_encoded

    for item in iterable:

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/flask/helpers.py", line 125, in generator

    yield from gen

  File "/Users/zhangnan/PycharmProjects/llmops-api/pkg/response/response.py", line 87, in generate

    yield from response

  File "/Users/zhangnan/PycharmProjects/llmops-api/internal/service/app_service.py", line 524, in debug_chat

    history = token_buffer_memory.get_history_prompt_messages(

  File "/Users/zhangnan/PycharmProjects/llmops-api/internal/core/memory/token_buffer_memory.py", line 56, in get_history_prompt_messages

    return trim_messages(

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/langchain_core/messages/utils.py", line 345, in wrapped

    return func(messages, **kwargs)

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/langchain_core/messages/utils.py", line 832, in trim_messages

    return _last_max_tokens(

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/langchain_core/messages/utils.py", line 947, in _last_max_tokens

    reversed_ = _first_max_tokens(

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/langchain_core/messages/utils.py", line 862, in _first_max_tokens

    if token_counter(messages[:-i] if i else messages) <= max_tokens:

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/langchain_core/language_models/base.py", line 377, in get_num_tokens_from_messages

    return sum([self.get_num_tokens(get_buffer_string([m])) for m in messages])

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/langchain_core/language_models/base.py", line 377, in <listcomp>

    return sum([self.get_num_tokens(get_buffer_string([m])) for m in messages])

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/langchain_core/language_models/base.py", line 364, in get_num_tokens

    return len(self.get_token_ids(text))

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/langchain_core/language_models/base.py", line 351, in get_token_ids

    return _get_token_ids_default_method(text)

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/langchain_core/language_models/base.py", line 80, in _get_token_ids_default_method

    tokenizer = get_tokenizer()

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/langchain_core/language_models/base.py", line 74, in get_tokenizer

    return GPT2TokenizerFast.from_pretrained("gpt2")

  File "/opt/anaconda3/envs/llmops/lib/python3.10/site-packages/transformers/tokenization_utils_base.py", line 2020, in from_pretrained

    raise EnvironmentError(

OSError: Can't load tokenizer for 'gpt2'. If you were trying to load it from 'https://huggingface.co/models', make sure you don't have a local directory with the same name. Otherwise, make sure 'gpt2' is the correct path to a directory containing all relevant files for a GPT2TokenizerFast tokenizer.