我正在尝试运行烧瓶运行(在安装Anaconda之前运行良好)的烧瓶应用程序,并且正在获取以下堆栈跟踪

Traceback (most recent call last):
  File "C:\Users\Rodrigo\Anaconda3\lib\runpy.py",line 193,in _run_module_as_main
    "__main__",mod_spec)
  File "C:\Users\Rodrigo\Anaconda3\lib\runpy.py",line 85,in _run_code
    exec(code,run_globals)
  File "C:\Users\Rodrigo\Documents\Project1\frontEnd\venv\Scripts\flask.exe\__main__.py",line 5,in <module>
  File "C:\Users\Rodrigo\Documents\Project1\frontEnd\venv\lib\site-packages\flask\__init__.py",line 19,in <module>
    from jinja2 import Markup,escape
  File "C:\Users\Rodrigo\Documents\Project1\frontEnd\venv\lib\site-packages\jinja2\__init__.py",line 82,in <module>
    _patch_async()
  File "C:\Users\Rodrigo\Documents\Project1\frontEnd\venv\lib\site-packages\jinja2\__init__.py",line 78,in _patch_async
    from jinja2.asyncsupport import patch_all
  File "C:\Users\Rodrigo\Documents\Project1\frontEnd\venv\lib\site-packages\jinja2\asyncsupport.py",line 13,in <module>
    import asyncio
  File "C:\Users\Rodrigo\Anaconda3\lib\asyncio\__init__.py",line 8,in <module>
    from .base_events import *
  File "C:\Users\Rodrigo\Anaconda3\lib\asyncio\base_events.py",line 39,in <module>
    from . import events
  File "C:\Users\Rodrigo\Anaconda3\lib\asyncio\events.py",line 14,in <module>
    import contextvars
  File "C:\Users\Rodrigo\Anaconda3\lib\contextvars.py",line 1,in <module>
    from _contextvars import Context,ContextVar,Token,copy_context

ModuleNotFoundError: No module named '_contextvars'

系统级别的Python版本是3.7.3
venv级别的Python版本是3.7.0

我已经尝试安装contextvars,但是它只升级了旧版本,没有解决问题.在系统级别和venv级别中,contextvars的要求已经满足.

我正在Windows 10上运行它.

关于什么可能导致此的任何想法？