doccano 解决 pydantic.errors.PydanticImportError: `pydantic:ConstrainedStr` has been removed in V2.

报错信息

  File "C:\Users\anaconda3\envs\UIE\lib\site-packages\pydantic\_migration.py", line 285, in wrapper
    raise PydanticImportError(f'`{import_path}` has been removed in V2.')
pydantic.errors.PydanticImportError: `pydantic:ConstrainedStr` has been removed in V2.

For further information visit https://errors.pydantic.dev/2.0.2/u/import-error

...

  File "C:\Users\anaconda3\envs\UIE\lib\site-packages\backend\data_import\datasets.py", line 12, in <module>
    from .pipeline.label import CategoryLabel, Label, RelationLabel, SpanLabel, TextLabel
  File "C:\Users\anaconda3\envs\UIE\lib\site-packages\backend\data_import\pipeline\label.py", line 5, in <module>
    from pydantic import UUID4, BaseModel, ConstrainedStr, NonNegativeInt, root_validator
  File "C:\Users\anaconda3\envs\UIE\lib\site-packages\pydantic\__init__.py", line 206, in __getattr__
    return _getattr_migration(attr_name)
  File "C:\Users\anaconda3\envs\UIE\lib\site-packages\pydantic\_migration.py", line 285, in wrapper
    raise PydanticImportError(f'`{import_path}` has been removed in V2.')
pydantic.errors.PydanticImportError: `pydantic:ConstrainedStr` has been removed in V2.

For further information visit https://errors.pydantic.dev/2.0.2/u/import-erro
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网页也无法打开

Internal Server Error

The server encountered an unexpected internal server error

(generated by waitress)
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环境

python3.9, python3.10 都支持
本人使用的是 doccano==1.8.3

描述

以前可以使用 doccano没有任何问题。
直到本人重新安装python 或者 创建新的python环境后，便无法使用 doccano。
因为 doccano 将配置信息写在用户文件夹下的 doccano文件夹内，删去该文件夹，删去以前的配置信息；

同时还有下述错误：

1. doccano 的webserver 网页打不开
2. doccano 导出的数据集没有标注数据

解决措施

1. 删除用户目录下的 doccano文件夹，重新执行 doccano init
   

2. pip install pydantic==1.10.11

3. 如果执行上述步骤，仍不能解决此问题，可尝试降低 doccano版本: pip install doccano==1.6.2

其他

doccano一直转圈圈

• doccano上传文件一直转圈圈
• doccano下载文件一直转圈圈
  在另一个命令窗口执行: doccano task