litellm - 💡(How to fix) Fix [Bug]: Trim Messages function does not support "File" content type.

Traceback (most recent call last):
  File "/app/.venv/lib/python3.13/site-packages/litellm/litellm_core_utils/token_counter.py", line 745, in _count_content_list
    raise ValueError(
    ...<2 lines>...
    )
ValueError: Invalid content item type: file. Expected str or dict with 'type' field (text, image_url, tool_use, tool_result, thinking).

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/app/.venv/lib/python3.13/site-packages/litellm/utils.py", line 7229, in trim_messages
    current_tokens = token_counter(model=model or "", messages=messages)
  File "/app/.venv/lib/python3.13/site-packages/litellm/utils.py", line 2320, in token_counter
    return _get_token_counter_new()(
           ~~~~~~~~~~~~~~~~~~~~~~~~^
        model,
        ^^^^^^
    ...<7 lines>...
        default_token_count,
        ^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/app/.venv/lib/python3.13/site-packages/litellm/litellm_core_utils/token_counter.py", line 422, in token_counter
    num_tokens = _count_messages(
        params, new_messages, use_default_image_token_count, default_token_count
    )
  File "/app/.venv/lib/python3.13/site-packages/litellm/litellm_core_utils/token_counter.py", line 483, in _count_messages
    num_tokens += _count_content_list(
                  ~~~~~~~~~~~~~~~~~~~^
        params.count_function,
        ^^^^^^^^^^^^^^^^^^^^^^
    ...<2 lines>...
        default_token_count,
        ^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/app/.venv/lib/python3.13/site-packages/litellm/litellm_core_utils/token_counter.py", line 753, in _count_content_list
    raise ValueError(
    ...<2 lines>...
    )
ValueError: Error getting number of tokens from content list: Invalid content item type: file. Expected str or dict with 'type' field (text, image_url, tool_use, tool_result, thinking)., default_token_count=None