正しいトークンを入力しているにも関わらずinvalid credential[Jupyter]

Jupyter notebook初回起動の際，正しいトークンを入力しているにも関わらずinvalid credentialが出るときには以下を試してみよう．

configを生成．もし既に存在していて，上書きの確認が出た時はNoを入力

jupyter notebook --generate-config

configのc.NotebookApp.allow_password_changeのコメントを外す．

# configを開く
vim jupyter_notebook_config.py

以下のようにアンコメントする．

## Allow password to be changed at login for the notebook server.
#
#  While loggin in with a token, the notebook server UI will give the opportunity
#  to the user to enter a new password at the same time that will replace the
#  token login mechanism.
#
#  This can be set to false to prevent changing password from the UI/API.
c.NotebookApp.allow_password_change = True
## Token used for authenticating first-time connections to the server.
#
#  When no password is enabled, the default is to generate a new, random token.
#
#  Setting to an empty string disables authentication altogether, which is NOT
#  RECOMMENDED.
# c.NotebookApp.token = ''

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