No module named 'pydantic_core._pydantic_core'

[digitalmaster]

Aider version: 0.78.0
Python version: 3.12.5
Platform: macOS-15.3.2-arm64-arm-64bit
Python implementation: CPython
Virtual environment: Yes
OS: Darwin 24.3.0 (64bit)
Git version: git version 2.39.2

An uncaught exception occurred:

Traceback (most recent call last):
  File "aider", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "main.py", line 1106, in main
    coder.run()
  File "base_coder.py", line 856, in run
    self.run_one(user_message, preproc)
  File "base_coder.py", line 897, in run_one
    message = self.preproc_user_input(user_message)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "base_coder.py", line 886, in preproc_user_input
    return self.commands.run(inp)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "commands.py", line 297, in run
    return self.do_run(command, rest_inp)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "commands.py", line 269, in do_run
    return cmd_method(args)
           ^^^^^^^^^^^^^^^^
  File "commands.py", line 1131, in cmd_ask
    return self._generic_chat_command(args, "ask")
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "commands.py", line 1156, in _generic_chat_command
    coder.run(user_msg)
  File "base_coder.py", line 849, in run
    self.run_one(with_message, preproc)
  File "base_coder.py", line 903, in run_one
    list(self.send_message(message))
  File "base_coder.py", line 1337, in send_message
    litellm_ex = LiteLLMExceptions()
                 ^^^^^^^^^^^^^^^^^^^
  File "exceptions.py", line 58, in __init__
    self._load()
  File "exceptions.py", line 61, in _load
    import litellm
  File "__init__.py", line 9, in <module>
    from litellm.llms.custom_httpx.http_handler import AsyncHTTPHandler, HTTPHandler
  File "http_handler.py", line 10, in <module>
    from litellm.litellm_core_utils.logging_utils import track_llm_api_timing
  File "logging_utils.py", line 7, in <module>
    from litellm.types.utils import (
  File "utils.py", line 8, in <module>
    from openai._models import BaseModel as OpenAIObject
  File "__init__.py", line 8, in <module>
    from . import types
  File "__init__.py", line 5, in <module>
    from .batch import Batch as Batch
  File "batch.py", line 6, in <module>
    from .._models import BaseModel
  File "_models.py", line 24, in <module>
    from pydantic.fields import FieldInfo
  File "fields.py", line 17, in <module>
    from pydantic_core import PydanticUndefined
  File "__init__.py", line 6, in <module>
    from ._pydantic_core import (
ModuleNotFoundError: No module named 'pydantic_core._pydantic_core'