I am a deep learning researcher. When I deployed version V2 and started training, ROOt_dir was not found, but I clearly configured this directory. I would like to ask, what is the cause of this, is it system related

[xianglei3]

Thanks for your error report and we appreciate it a lot.

Checklist

1. I have searched related issues but cannot get the expected help.
2. The bug has not been fixed in the latest version.

Describe the bug
A clear and concise description of what the bug is.
Can't find root_dir
Reproduction

1. What command or script did you run?

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```python tools/train  configs...
2. Did you make any modifications on the code or config? Did you understand what you have modified?
3. What dataset did you use?

**Environment**
cuda11.3
1. Please run `python mmdet/utils/collect_env.py` to collect necessary environment infomation and paste it here.
2. You may add addition that may be helpful for locating the problem, such as
    - How you installed PyTorch [e.g., pip, conda, source]
    - Other environment variables that may be related (such as `$PATH`, `$LD_LIBRARY_PATH`, `$PYTHONPATH`, etc.)

**Error traceback**
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**Bug fix**
If you have already identified the reason, you can provide the information here. If you are willing to create a PR to fix it, please also leave a comment here and that would be much appreciated!