ValueError: mutable default <class 'hydra.conf.JobConf.JobConfig.OverrideDirname'> for field override_dirname is not allowed: use default_factory```

[tanyufang]

hello, Tim and Venia! I'm pretty new to coding, and I ran into some issues while running the code. When I try to run it on my own machine, I keep running into an error with hydra (pasted below). My system is Windows-based, and I'm using Python version 3.11.0.

Do you have insights on how to fix this error?

Traceback (most recent call last):
  File "E:\xiada\LAMEN\src\run_scratch.py", line 2, in <module>
    import hydra
  File "D:\Ana\envs\lamen\Lib\site-packages\hydra\__init__.py", line 5, in <module>
    from hydra import utils
  File "D:\Ana\envs\lamen\Lib\site-packages\hydra\utils.py", line 8, in <module>
    import hydra._internal.instantiate._instantiate2
  File "D:\Ana\envs\lamen\Lib\site-packages\hydra\_internal\instantiate\_instantiate2.py", line 12, in <module>
    from hydra._internal.utils import _locate
  File "D:\Ana\envs\lamen\Lib\site-packages\hydra\_internal\utils.py", line 18, in <module>
    from hydra.core.utils import get_valid_filename, validate_config_path
  File "D:\Ana\envs\lamen\Lib\site-packages\hydra\core\utils.py", line 20, in <module>
    from hydra.core.hydra_config import HydraConfig
  File "D:\Ana\envs\lamen\Lib\site-packages\hydra\core\hydra_config.py", line 6, in <module>
    from hydra.conf import HydraConf
  File "D:\Ana\envs\lamen\Lib\site-packages\hydra\conf\__init__.py", line 46, in <module>
    class JobConf:
  File "D:\Ana\envs\lamen\Lib\site-packages\hydra\conf\__init__.py", line 75, in JobConf
    @dataclass
     ^^^^^^^^^
  File "D:\Ana\envs\lamen\Lib\dataclasses.py", line 1221, in dataclass
    return wrap(cls)
           ^^^^^^^^^
  File "D:\Ana\envs\lamen\Lib\dataclasses.py", line 1211, in wrap
    return _process_class(cls, init, repr, eq, order, unsafe_hash,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Ana\envs\lamen\Lib\dataclasses.py", line 959, in _process_class
    cls_fields.append(_get_field(cls, name, type, kw_only))
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Ana\envs\lamen\Lib\dataclasses.py", line 816, in _get_field
    raise ValueError(f'mutable default {type(f.default)} for field '
ValueError: mutable default <class 'hydra.conf.JobConf.JobConfig.OverrideDirname'> for field override_dirname is not allowed: use default_factory```