# Uncaught exection GET /api/kernel error message in notebook

**URL:** <https://discourse.jupyter.org/t/uncaught-exection-get-api-kernel-error-message-in-notebook/7512>\
**Category:** Notebook\
**Created:** [January 14, 2021, 8:32am UTC](https://discourse.jupyter.org/t/uncaught-exection-get-api-kernel-error-message-in-notebook/7512 "2021-01-14T08:32:33Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![fmelendez](https://avatars.discourse-cdn.com/v4/letter/f/46a35a/32.png) [@fmelendez](https://discourse.jupyter.org/u/fmelendez)\
**Post date:** [January 14, 2021, 8:32am UTC](https://discourse.jupyter.org/t/uncaught-exection-get-api-kernel-error-message-in-notebook/7512/1 "2021-01-14T08:32:33Z")

</div>

Does someone here have experience on troubleshooting kernel errors?

When creating a new notebook we get an Uncaught exection GET /api/kernel error message.

Does this error involve conflicts in packages ?

jupyter --version

```auto
jupyter core : 4.6.1
jupyter-notebook : 6.0.2
qtconsole : 4.6.0
ipython : 7.10.1
ipykernel : 5.1.3
jupyter client : 5.3.4
jupyter lab : 1.2.3
nbconvert : 5.6.1
ipywidgets : 7.5.1
nbformat : 4.4.0
traitlets : 4.3.3

```

pip list:

```auto
alabaster (0.7.12)
anchor-exp (0.0.0.6)
appdirs (1.4.4)
argh (0.26.2)
asn1crypto (1.2.0)
astroid (2.3.3)
astropy (3.2.3)
atomicwrites (1.3.0)
attrs (19.3.0)
autopep8 (1.4.4)
Babel (2.7.0)
backcall (0.1.0)
backports.functools-lru-cache (1.6.1)
backports.os (0.1.1)
backports.shutil-get-terminal-size (1.0.0)
backports.tempfile (1.0)
backports.weakref (1.0.post1)
beautifulsoup4 (4.8.1)
biopandas (0.2.4)
bitarray (1.1.0)
bkcharts (0.2)
black (19.10b0)
bleach (3.1.0)
blis (0.4.1)
bokeh (1.4.0)
boto (2.49.0)
boto3 (1.10.36)
botocore (1.13.36)
Bottleneck (1.3.1)
CacheControl (0.12.6)
cachy (0.3.0)
catalogue (0.0.8)
cchardet (2.1.5)
certifi (2019.11.28)
cffi (1.13.2)
chardet (3.0.4)
cleo (0.7.6)
Click (7.0)
click-default-group (1.2.2)
clikit (0.4.3)
cloudpickle (1.2.2)
clyent (1.2.1)
colorama (0.4.1)
contextlib2 (0.6.0.post1)
cryptography (2.8)
cycler (0.10.0)
cymem (2.0.3)
Cython (0.29.14)
cytoolz (0.10.1)
dash (1.7.0)
dash-core-components (1.6.0)
dash-html-components (1.0.2)
dash-renderer (1.2.2)
dash-table (4.5.1)
dask (2.9.0)
datapackage (1.10.0)
decorator (4.4.1)
defusedxml (0.6.0)
diff-match-patch (20181111)
distributed (2.9.0)
docutils (0.15.2)
entrypoints (0.3)
et-xmlfile (1.0.1)
fastcache (1.1.0)
filelock (3.0.12)
flake8 (3.7.9)
Flask (1.1.1)
Flask-Compress (1.4.0)
fsspec (0.6.0)
future (0.18.2)
gevent (1.4.0)
glob2 (0.7)
gmpy2 (2.0.8)
gnureadline (8.0.0)
goodtables (2.4.1)
greenlet (0.4.15)
h5py (2.9.0)
HeapDict (1.0.1)
helpdev (0.7.1)
html5lib (1.0.1)
idna (2.8)
ijson (2.5.1)
imageio (2.6.1)
imagesize (1.1.0)
imbalanced-learn (0.6.1)
importlib-metadata (1.2.0)
intervaltree (3.0.2)
ipykernel (5.1.3)
ipython (7.10.1)
ipython-autotime (0.1)
ipython-genutils (0.2.0)
ipywidgets (7.5.1)
isodate (0.6.0)
isort (4.3.21)
itsdangerous (1.1.0)
jdcal (1.4.1)
jedi (0.14.1)
jeepney (0.4.1)
Jinja2 (2.10.3)
jmespath (0.9.4)
joblib (0.14.0)
json5 (0.8.5)
jsonlines (1.2.0)
jsonpointer (2.0)
jsonschema (3.2.0)
jupyter (1.0.0)
jupyter-client (5.3.4)
jupyter-console (6.0.0)
jupyter-contrib-core (0.3.3)
jupyter-contrib-nbextensions (0.5.1)
jupyter-core (4.6.1)
jupyter-highlight-selected-word (0.2.0)
jupyter-latex-envs (1.4.6)
jupyter-nbextensions-configurator (0.4.1)
jupyterlab (1.2.3)
jupyterlab-server (1.0.6)
keyring (19.2.0)
kiwisolver (1.1.0)
lazy-object-proxy (1.4.3)
libarchive-c (2.8)
lime (0.1.1.36)
linear-tsv (1.1.0)
llvmlite (0.31.0)
locket (0.2.0)
lockfile (0.12.2)
lxml (4.4.2)
MarkupSafe (1.1.1)
matplotlib (3.1.1)
matplotlib-venn (0.11.5)
mccabe (0.6.1)
mistune (0.8.4)
mock (3.0.5)
more-itertools (7.2.0)
mpmath (1.1.0)
msgpack (0.6.1)
multipledispatch (0.6.0)
murmurhash (1.0.2)
nbconvert (5.6.1)
nbformat (4.4.0)
networkx (2.4)
nltk (3.4.5)
nose (1.3.7)
notebook (6.0.2)
numba (0.46.0)
numexpr (2.7.0)
numpy (1.17.4)
numpydoc (0.9.1)
olefile (0.46)
openpyxl (3.0.2)
packaging (19.2)
pandas (0.25.3)
pandocfilters (1.4.2)
parso (0.5.1)
partd (1.1.0)
pastel (0.2.1)
path.py (12.0.2)
pathlib2 (2.3.5)
pathspec (0.8.0)
pathtools (0.1.2)
patsy (0.5.1)
pep8 (1.7.1)
pexpect (4.7.0)
pickleshare (0.7.5)
Pillow (6.2.1)
pip (9.0.1)
pkginfo (1.5.0.1)
plac (1.1.3)
plotly (4.4.1)
pluggy (0.13.1)
ply (3.11)
poetry (1.0.5)
poetry-core (1.0.0a1)
preshed (3.0.2)
prometheus-client (0.7.1)
prompt-toolkit (2.0.9)
psutil (5.6.7)
psycopg2 (2.8.4)
ptyprocess (0.6.0)
py (1.8.0)
pycodestyle (2.5.0)
pycosat (0.6.3)
pycparser (2.19)
pycrypto (2.6.1)
pydocstyle (4.0.1)
pydqc (0.1.0)
pyflakes (2.1.1)
Pygments (2.5.2)
pylev (1.3.0)
pylint (2.4.4)
Pympler (0.7)
pyodbc (4.0.27)
pyOpenSSL (19.1.0)
pyparsing (2.4.5)
pyrsistent (0.15.6)
PySocks (1.7.1)
pytest (5.3.1)
pytest-arraydiff (0.3)
pytest-astropy (0.6.0)
pytest-astropy-header (0.1.1)
pytest-doctestplus (0.5.0)
pytest-openfiles (0.4.0)
pytest-remotedata (0.3.2)
python-dateutil (2.8.1)
python-jsonrpc-server (0.3.2)
python-language-server (0.31.2)
pytz (2019.3)
PyWavelets (1.1.1)
pyxdg (0.26)
PyYAML (5.3.1)
pyzmq (18.1.0)
q (2.6)
QDarkStyle (2.7)
QtAwesome (0.6.0)
qtconsole (4.6.0)
QtPy (1.9.0)
readline (6.2.4.1)
regex (2020.10.28)
requests (2.22.0)
requests-toolbelt (0.8.0)
retrying (1.3.3)
rfc3986 (1.3.2)
rope (0.14.0)
Rtree (0.8.3)
s3transfer (0.2.1)
scikit-image (0.15.0)
scikit-learn (0.21.3)
scipy (1.3.2)
seaborn (0.9.0)
SecretStorage (3.1.1)
Send2Trash (1.5.0)
shellingham (1.3.2)
simpleeval (0.9.10)
simplegeneric (0.8.1)
singledispatch (3.4.0.3)
six (1.13.0)
snowballstemmer (2.0.0)
sortedcollections (1.1.2)
sortedcontainers (2.1.0)
soupsieve (1.9.5)
spacy (2.2.3)
Sphinx (2.2.2)
sphinxcontrib-applehelp (1.0.1)
sphinxcontrib-devhelp (1.0.1)
sphinxcontrib-htmlhelp (1.0.2)
sphinxcontrib-jsmath (1.0.1)
sphinxcontrib-qthelp (1.0.2)
sphinxcontrib-serializinghtml (1.1.3)
sphinxcontrib-websupport (1.1.2)
SQLAlchemy (1.3.11)
srsly (0.2.0)
statistics (1.0.3.5)
statsmodels (0.10.1)
sympy (1.4)
tables (3.6.1)
tableschema (1.12.0)
tabulator (1.31.0)
tblib (1.5.0)
terminado (0.8.3)
testpath (0.4.4)
thinc (7.3.1)
toml (0.10.2)
tomlkit (0.5.11)
toolz (0.10.0)
tornado (6.0.3)
tqdm (4.40.0)
traitlets (4.3.3)
typed-ast (1.4.1)
ujson (1.35)
unicodecsv (0.14.1)
urllib3 (1.25.7)
wasabi (0.4.2)
watchdog (0.9.0)
wcwidth (0.1.7)
webencodings (0.5.1)
Werkzeug (0.16.0)
widgetsnbextension (3.5.1)
wrapt (1.11.2)
wurlitzer (2.0.0)
xlrd (1.2.0)
XlsxWriter (1.2.6)
xlwt (1.3.0)
yapf (0.28.0)
zict (1.0.0)
zipp (0.6.0)

```

---

<div class="post-metadata">

**Author:** ![Zsailer](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/zsailer/32/4872_2.png) [@Zsailer](https://discourse.jupyter.org/u/Zsailer)\
**Post date:** [January 15, 2021, 6:02pm UTC](https://discourse.jupyter.org/t/uncaught-exection-get-api-kernel-error-message-in-notebook/7512/2 "2021-01-15T18:02:40Z")

</div>

Nothing about those versions should lead to that 500. I just recreated your environment and everything works fine. Can you restart your notebook server using the `--debug` flag and share your output here?

```auto
> jupyter notebook --debug

```

---

<div class="post-metadata">

**Author:** ![fmelendez](https://avatars.discourse-cdn.com/v4/letter/f/46a35a/32.png) [@fmelendez](https://discourse.jupyter.org/u/fmelendez)\
**Post date:** [January 18, 2021, 7:26am UTC](https://discourse.jupyter.org/t/uncaught-exection-get-api-kernel-error-message-in-notebook/7512/3 "2021-01-18T07:26:25Z")

</div>

We solved this problem by using another browser (from Midori to Firefox).

Debugging did not result in usable info.  
After troubleshooting a working image and a failing image, we found out that the new webkit-package crashed the API-calls to the kernel.