Jupyter notebookを起動させようとするとエラーが出る

Jupyter notebookを起動させようとしたらエラーが出るようになりました

ターミナルからJupyter notebookを起動させたいです。
以前はターミナルにjupyter notebookと打ち込むだけで起動出来たのですが、何かの不具合でウィンドウが開きません。
また、アイコンから起動させようとしても同様のエラーが表示されます。

発生している問題・エラーメッセージ

This launches a Tornado based HTML Notebook Server that serves up an
HTML5/Javascript Notebook client.

該当のソースコード

python
1This launches a Tornado based HTML Notebook Server that serves up an
2HTML5/Javascript Notebook client.
3
4Subcommands
5-----------
6
7Subcommands are launched as `jupyter-notebook cmd [args]`. For information on
8using subcommand 'cmd', do: `jupyter-notebook cmd -h`.
9
10list
11    List currently running notebook servers.
12stop
13    Stop currently running notebook server for a given port
14password
15    Set a password for the notebook server.
16
17Options
18-------
19
20Arguments that take values are actually convenience aliases to full
21Configurables, whose aliases are listed on the help line. For more information
22on full configurables, see '--help-all'.
23
24--debug
25    set log level to logging.DEBUG (maximize logging output)
26--generate-config
27    generate default config file
28-y
29    Answer yes to any questions instead of prompting.
30--no-browser
31    Don't open the notebook in a browser after startup.
32--pylab
33    DISABLED: use %pylab or %matplotlib in the notebook to enable matplotlib.
34--no-mathjax
35    Disable MathJax
36    
37    MathJax is the javascript library Jupyter uses to render math/LaTeX. It is
38    very large, so you may want to disable it if you have a slow internet
39    connection, or for offline use of the notebook.
40    
41    When disabled, equations etc. will appear as their untransformed TeX source.
42--allow-root
43    Allow the notebook to be run from root user.
44--script
45    DEPRECATED, IGNORED
46--no-script
47    DEPRECATED, IGNORED
48--log-level=<Enum> (Application.log_level)
49    Default: 30
50    Choices: (0, 10, 20, 30, 40, 50, 'DEBUG', 'INFO', 'WARN', 'ERROR', 'CRITICAL')
51    Set the log level by value or name.
52--config=<Unicode> (JupyterApp.config_file)
53    Default: ''
54    Full path of a config file.
55--ip=<Unicode> (NotebookApp.ip)
56    Default: 'localhost'
57    The IP address the notebook server will listen on.
58--port=<Int> (NotebookApp.port)
59    Default: 8888
60    The port the notebook server will listen on.
61--port-retries=<Int> (NotebookApp.port_retries)
62    Default: 50
63    The number of additional ports to try if the specified port is not
64    available.
65--transport=<CaselessStrEnum> (KernelManager.transport)
66    Default: 'tcp'
67    Choices: ['tcp', 'ipc']
68--keyfile=<Unicode> (NotebookApp.keyfile)
69    Default: ''
70    The full path to a private key file for usage with SSL/TLS.
71--certfile=<Unicode> (NotebookApp.certfile)
72    Default: ''
73    The full path to an SSL/TLS certificate file.
74--client-ca=<Unicode> (NotebookApp.client_ca)
75    Default: ''
76    The full path to a certificate authority certificate for SSL/TLS client
77    authentication.
78--notebook-dir=<Unicode> (NotebookApp.notebook_dir)
79    Default: ''
80    The directory to use for notebooks and kernels.
81--browser=<Unicode> (NotebookApp.browser)
82    Default: ''
83    Specify what command to use to invoke a web browser when opening the
84    notebook. If not specified, the default browser will be determined by the
85    `webbrowser` standard library module, which allows setting of the BROWSER
86    environment variable to override it.
87--pylab=<Unicode> (NotebookApp.pylab)
88    Default: 'disabled'
89    DISABLED: use %pylab or %matplotlib in the notebook to enable matplotlib.
90--gateway-url=<Unicode> (GatewayClient.url)
91    Default: None
92    The url of the Kernel or Enterprise Gateway server where kernel
93    specifications are defined and kernel management takes place. If defined,
94    this Notebook server acts as a proxy for all kernel management and kernel
95    specification retrieval.  (JUPYTER_GATEWAY_URL env var)
96
97To see all available configurables, use `--help-all`
98
99Examples
100--------
101
102    jupyter notebook                       # start the notebook
103    jupyter notebook --certfile=mycert.pem # use SSL/TLS certificate
104    jupyter notebook password              # enter a password to protect the server
105
106[C 22:11:18.071 NotebookApp] Bad config encountered during initialization:
107[C 22:11:18.071 NotebookApp] The 'kernel_spec_manager_class' trait of <notebook.notebookapp.NotebookApp object at 0x10c1803c8> instance must be a type, but 'environment_kernels.EnvironmentKernelSpecManager' could not be imported

試したこと

調べてみたところ、シェルを変えると直るとの記述があったため、bashに変更してみました。しかし、直りませんでした。

補足情報（FW/ツールのバージョンなど）

行動規範の内容に同意します

回答2件

つい最近同様エラー出ましたが
Jupyter Notebookで仮想環境を使用できなくなってしまった時の対処法にて解消しました。参考まで。

(py4kasou) ~$ pip install environment-kernels

はい。これだけ。

投稿2020/02/20 13:55

can110

総合スコア38266

Examples

jupyter notebook                       # start the notebook

上記ログを参照しますと、コマンドは jupyter notebook だけで起動できそうです。
起動に失敗する原因は以下だと思われます。

[C 22:11:18.071 NotebookApp] Bad config encountered during initialization:

[C 22:11:18.071 NotebookApp] The 'kernel_spec_manager_class' trait of <notebook.notebookapp.NotebookApp object at 0x10c1803c8> instance must be a type, but 'environment_kernels.EnvironmentKernelSpecManager' could not be imported

可能であれば、jupyter notebookを再インストールしてみてはいかがでしょうか。

投稿2020/02/20 13:11