Formatter not found!

Checklist prior to opening an issue

• I have followed fully the installation steps laid out in the documentation site.
• I have restarted jupyterlab.
• I have read the FAQ section in the documentation site.

Describe the bug To the best of my knowledge, I have followed the install directions, but I get an error that says “Formatter not found!”

Diagnostic commands Please attach the output of the following commands (please format them properly)

• pip freeze

appdirs==1.4.3
appnope==0.1.0
attrs==19.3.0
backcall==0.1.0
beautifulsoup4==4.9.0
black==19.10b0
bleach==3.1.4
brotlipy==0.7.0
certifi==2020.4.5.1
cffi==1.14.0
chardet==3.0.4
click==7.1.2
cryptography==2.9.2
decorator==4.4.2
defusedxml==0.6.0
entrypoints==0.3
flake8==3.7.9
idna==2.9
importlib-metadata==1.6.0
ipykernel==5.2.1
ipython==7.13.0
ipython-genutils==0.2.0
ipywidgets==7.5.1
jedi==0.17.0
Jinja2==2.11.2
json5==0.9.0
jsonschema==3.2.0
jupyter-client==6.1.3
jupyter-console==6.1.0
jupyter-core==4.6.3
jupyterlab==2.1.0
jupyterlab-code-formatter==1.2.5
jupyterlab-server==1.1.1
MarkupSafe==1.1.1
marshmallow==3.5.2
mccabe==0.6.1
mistune==0.8.4
mypy-extensions==0.4.3
nbconvert==5.6.1
nbformat==5.0.6
notebook==6.0.3
# Editable Git install with no remote (nysdump==0.1)
-e /Users/josh/software/jfhbrook/nys-data
packaging==20.1
pandocfilters==1.4.2
parso==0.7.0
pathspec==0.8.0
pexpect==4.8.0
pickleshare==0.7.5
prometheus-client==0.7.1
prompt-toolkit==3.0.5
ptyprocess==0.6.0
pycodestyle==2.5.0
pycparser==2.20
pyflakes==2.1.1
Pygments==2.6.1
pyOpenSSL==19.1.0
pyparsing==2.4.7
PyQt5==5.12.3
PyQt5-sip==4.19.18
PyQtWebEngine==5.12.1
pyrsistent==0.16.0
PySocks==1.7.1
python-dateutil==2.8.1
pyzmq==19.0.0
qtconsole==4.7.3
QtPy==1.9.0
regex==2020.4.4
requests==2.23.0
Send2Trash==1.5.0
six==1.14.0
soupsieve==1.9.4
terminado==0.8.3
testpath==0.4.4
toml==0.10.0
tornado==6.0.4
tqdm==4.45.0
traitlets==4.3.3
typed-ast==1.4.1
typing-extensions==3.7.4.1
urllib3==1.25.9
wcwidth==0.1.9
webencodings==0.5.1
widgetsnbextension==3.5.1
zipp==3.1.0

• jupyter labextension list

JupyterLab v2.1.0
Known labextensions:
   app dir: /Users/josh/opt/anaconda3/envs/nys-data/share/jupyter/lab
        @jupyter-widgets/jupyterlab-manager v2.0.0  enabled  OK
        @ryantam626/jupyterlab_code_formatter v1.2.5  enabled  OK
        jupyterlab-flake8 v0.6.1  enabled  OK

• jupyter serverextension list

config dir: /Users/josh/.jupyter
    jupyterlab_code_formatter  enabled
    - Validating...
      jupyterlab_code_formatter  OK
config dir: /Users/josh/opt/anaconda3/envs/nys-data/etc/jupyter
    jupyterlab  enabled
    - Validating...
      jupyterlab 2.1.0 OK

For good measure:

• conda env export

name: nys-data
channels:
  - conda-forge
  - defaults
dependencies:
  - appdirs=1.4.3=py_1
  - appnope=0.1.0=py37hc8dfbb8_1001
  - attrs=19.3.0=py_0
  - backcall=0.1.0=py_0
  - beautifulsoup4=4.9.0=py37hc8dfbb8_0
  - black=19.10b0=py37_0
  - bleach=3.1.4=pyh9f0ad1d_0
  - brotlipy=0.7.0=py37h9bfed18_1000
  - ca-certificates=2020.4.5.1=hecc5488_0
  - certifi=2020.4.5.1=py37hc8dfbb8_0
  - cffi=1.14.0=py37h356ff06_0
  - chardet=3.0.4=py37hc8dfbb8_1006
  - click=7.1.2=pyh9f0ad1d_0
  - cryptography=2.9.2=py37he655712_0
  - dbus=1.13.6=h2f22bb5_0
  - decorator=4.4.2=py_0
  - defusedxml=0.6.0=py_0
  - entrypoints=0.3=py37hc8dfbb8_1001
  - expat=2.2.9=h4a8c4bd_2
  - flake8=3.7.9=py37hc8dfbb8_1
  - gettext=0.19.8.1=h46ab8bc_1002
  - glib=2.64.2=h577aef8_0
  - icu=64.2=h6de7cb9_1
  - idna=2.9=py_1
  - importlib-metadata=1.6.0=py37hc8dfbb8_0
  - importlib_metadata=1.6.0=0
  - ipykernel=5.2.1=py37h43977f1_0
  - ipython=7.13.0=py37hc8dfbb8_2
  - ipython_genutils=0.2.0=py_1
  - ipywidgets=7.5.1=py_0
  - jedi=0.17.0=py37hc8dfbb8_0
  - jinja2=2.11.2=pyh9f0ad1d_0
  - jpeg=9c=h1de35cc_1001
  - json5=0.9.0=py_0
  - jsonschema=3.2.0=py37hc8dfbb8_1
  - jupyter=1.0.0=py_2
  - jupyter_client=6.1.3=py_0
  - jupyter_console=6.1.0=py_1
  - jupyter_core=4.6.3=py37hc8dfbb8_1
  - jupyterlab=2.1.0=py_1
  - jupyterlab_code_formatter=1.2.5=py_0
  - jupyterlab_server=1.1.1=py_0
  - krb5=1.17.1=h1752a42_0
  - libclang=9.0.1=default_hf57f61e_0
  - libcxx=10.0.0=h1af66ff_2
  - libedit=3.1.20170329=hcfe32e1_1001
  - libffi=3.2.1=h4a8c4bd_1007
  - libiconv=1.15=h0b31af3_1006
  - libllvm9=9.0.1=h7475705_1
  - libpng=1.6.37=hbbe82c9_1
  - libpq=12.2=h489d428_1
  - libsodium=1.0.17=h01d97ff_0
  - libuv=1.34.0=h0b31af3_0
  - markupsafe=1.1.1=py37h9bfed18_1
  - marshmallow=3.5.2=py_0
  - mccabe=0.6.1=py_1
  - mistune=0.8.4=py37h9bfed18_1001
  - mypy_extensions=0.4.3=py37hc8dfbb8_1
  - nbconvert=5.6.1=py37hc8dfbb8_1
  - nbformat=5.0.6=py_0
  - ncurses=6.1=h0a44026_1002
  - nodejs=13.13.0=h38d8c5a_0
  - notebook=6.0.3=py37_0
  - nspr=4.20=h0a44026_1000
  - nss=3.47=hc0980d9_0
  - openssl=1.1.1g=h0b31af3_0
  - packaging=20.1=py_0
  - pandoc=2.9.2.1=0
  - pandocfilters=1.4.2=py_1
  - parso=0.7.0=pyh9f0ad1d_0
  - pathspec=0.8.0=pyh9f0ad1d_0
  - pcre=8.44=h4a8c4bd_0
  - pexpect=4.8.0=py37hc8dfbb8_1
  - pickleshare=0.7.5=py37hc8dfbb8_1001
  - pip=20.0.2=py_2
  - prometheus_client=0.7.1=py_0
  - prompt-toolkit=3.0.5=py_0
  - prompt_toolkit=3.0.5=0
  - ptyprocess=0.6.0=py_1001
  - pycodestyle=2.5.0=py_0
  - pycparser=2.20=py_0
  - pyflakes=2.1.1=py_0
  - pygments=2.6.1=py_0
  - pyopenssl=19.1.0=py_1
  - pyparsing=2.4.7=pyh9f0ad1d_0
  - pyqt=5.12.3=py37he22c54c_1
  - pyrsistent=0.16.0=py37h9bfed18_0
  - pysocks=1.7.1=py37hc8dfbb8_1
  - python=3.7.6=h90870a6_5_cpython
  - python-dateutil=2.8.1=py_0
  - python_abi=3.7=1_cp37m
  - pyzmq=19.0.0=py37haec44b1_1
  - qt=5.12.5=h514805e_3
  - qtconsole=4.7.3=pyh9f0ad1d_0
  - qtpy=1.9.0=py_0
  - readline=8.0=hcfe32e1_0
  - regex=2020.4.4=py37h9bfed18_0
  - requests=2.23.0=pyh8c360ce_2
  - send2trash=1.5.0=py_0
  - setuptools=46.1.3=py37hc8dfbb8_0
  - six=1.14.0=py_1
  - soupsieve=1.9.4=py37hc8dfbb8_1
  - sqlite=3.30.1=h93121df_0
  - terminado=0.8.3=py37hc8dfbb8_1
  - testpath=0.4.4=py_0
  - tk=8.6.10=hbbe82c9_0
  - toml=0.10.0=py_0
  - tornado=6.0.4=py37h9bfed18_1
  - tqdm=4.45.0=pyh9f0ad1d_1
  - traitlets=4.3.3=py37hc8dfbb8_1
  - typed-ast=1.4.1=py37h0b31af3_0
  - typing_extensions=3.7.4.1=py37hc8dfbb8_3
  - urllib3=1.25.9=py_0
  - wcwidth=0.1.9=pyh9f0ad1d_0
  - webencodings=0.5.1=py_1
  - wheel=0.34.2=py_1
  - widgetsnbextension=3.5.1=py37_0
  - xz=5.2.5=h0b31af3_0
  - zeromq=4.3.2=h6de7cb9_2
  - zipp=3.1.0=py_0
  - zlib=1.2.11=h0b31af3_1006
  - pip:
    - pyqt5-sip==4.19.18
    - pyqtwebengine==5.12.1
prefix: /Users/josh/opt/anaconda3/envs/nys-data

the output of various which’s:

(nys-data) [josh@vulpix nys-data]$ which jupyter
/Users/josh/opt/anaconda3/envs/nys-data/bin/jupyter
(nys-data) [josh@vulpix nys-data]$ which black
/Users/josh/opt/anaconda3/envs/nys-data/bin/black
(nys-data) [josh@vulpix nys-data]$ which python
/Users/josh/opt/anaconda3/envs/nys-data/bin/python

Screenshots If applicable, add screenshots to help explain your problem.

Additional context Add any other context about the problem here.

[jfhbrook]

OK dope. I installed isort and now everything is working great. Thanks!

[ryantam626]

Ah, this is due to a recent change to set isort and black as default formatters, I forgot to update the docs to highlight this.

Also the error message is not very clear what went wrong and can be improved.

I will pick this up this week 👍 (and as @acere pointed out, you can fix it by either method he posted)