我已经在我的根环境和其他一些环境中使用jupyter笔记本几个月了。上周升级到jupyter笔记本电脑5，直到昨天才运行良好。
昨天 - 电脑僵住了。重新启动后，jupyter notebook从root环境启动时出现错误（2x）：
（某些信息替换为＃下方）
[I 08:57:31.223 NotebookApp] Serving notebooks from local directory: #######
[I 08:57:31.223 NotebookApp] 0 active kernels
[I 08:57:31.223 NotebookApp] The Jupyter Notebook is running at: http://localhost:8888/?token=########################
[I 08:57:31.223 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 08:57:31.224 NotebookApp]
Copy/paste this URL into your browser when you connect for the first time,
to login with a token:
http://localhost:8888/?token=########################
[I 08:57:32.992 NotebookApp] Accepting one-time-token-authenticated connection from ::1
[I 08:58:01.367 NotebookApp] Kernel started: ###########
[I 08:58:02.775 NotebookApp] Adapting to protocol v5.1 for kernel ############
[IPKernelApp] ERROR | No such comm target registered: jupyter.widget.version
[IPKernelApp] ERROR | No such comm target registered: jupyter.widget.version
我已尝试复制并粘贴上面提供的链接。它在下次启动时删除了一条错误消息，然后在尝试再次启动后删除了2条错误消息。
Jupyter笔记本在从不同的conda环境启动时工作。
有关如何让我的root环境再次运行的任何想法？