ERROR: Kernel busy (Cell move forward without execution)

[jishanshaikh4]

System: 3.6.5 | Anaconda, Inc.| (default, Mar 29 2018, 13:32:41) [MSC v.1900 64 bit (AMD64)] on Windows 10.

Notebook Installation details: Anaconda version 5.2.0 (64 bit).

What are some problem details?
In the notebook, the default kernel ipykernel (at /ipykernel/resources) is showing busy (kernel busy). Python scripts are not running on it, and instead of showing anything the cell moves forward to new cell. The problem remains same whether notebook started from anaconda-navigator or using command prompt (cmd-windows) as jupyter notebook showing-

[I 23:34:53.660 NotebookApp] JupyterLab application directory is C:\Users\HP\Anaconda3\share\jupyter\lab
[I 23:34:53.815 NotebookApp] Serving notebooks from local directory: C:\Users\HP
[I 23:34:53.816 NotebookApp] 0 active kernels
[I 23:34:53.817 NotebookApp] The Jupyter Notebook is running at:
[I 23:34:53.817 NotebookApp] http://localhost:8888/?token=0b76b73e45b5bb884d872e0481e94ea45d4ad074a6cb539f
[I 23:34:53.817 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 23:34:53.823 NotebookApp]

Copy/paste this URL into your browser when you connect for the first time,
to login with a token:
    http://localhost:8888/?token=0b76b73e45b5bb884d872e0481e94ea45d4ad074a6cb539f&token=0b76b73e45b5bb884d872e0481e94ea45d4ad074a6cb539f

Notice that third line showing 0 active kernels.

A screenshot of running jupyter notebook is
.

This problem looks similar to #3612 and #3724.

More details

Output of jupyter kernelspec list (It was showing python3 kernel when we tried installing python3 kernel, and it didn't work).

Available kernels:
python3 C:\Users/HP/.local/Library/python3.6/site-packages/ipykernel/resources

Here is the output of jupyter troubleshoot:

$PATH:
C:\ProgramData\Oracle\Java\javapath
C:\Windows\system32
C:\Windows
C:\Windows\System32\Wbem
C:\Windows\System32\WindowsPowerShell\v1.0
C:\Program Files (x86)\MySQL\MySQL Server 5.5\bin
C:\Users\HP\AppData\Local\GitHubDesktop\bin
C:\adb
C:\Program Files\Git\cmd
C:\WINDOWS\system32
C:\WINDOWS
C:\WINDOWS\System32\Wbem
C:\WINDOWS\System32\WindowsPowerShell\v1.0
C:\WINDOWS\System32\OpenSSH
E:\Microprocessor\GTK\GTK2-Runtime\lib
C:\Program Files\Microsoft VS Code\bin
C:\Users\HP\Anaconda3
C:\Users\HP\Anaconda3\Library\mingw-w64\bin
C:\Users\HP\Anaconda3\Library\usr\bin
C:\Users\HP\Anaconda3\Library\bin
C:\Users\HP\Anaconda3\Scripts
C:\Users\HP\AppData\Local\GitHubDesktop\bin
C:\Users\HP\AppData\Local\Microsoft\WindowsApps

sys.path:
C:\Users\HP\Anaconda3\Scripts
C:\Users\HP\Anaconda3\python36.zip
C:\Users\HP\Anaconda3\DLLs
C:\Users\HP\Anaconda3\lib
C:\Users\HP\Anaconda3
C:\Users\HP\Anaconda3\lib\site-packages
C:\Users\HP\Anaconda3\lib\site-packages\win32
C:\Users\HP\Anaconda3\lib\site-packages\win32\lib
C:\Users\HP\Anaconda3\lib\site-packages\Pythonwin

sys.executable:
C:\Users\HP\Anaconda3\python.exe

sys.version:
3.6.5 |Anaconda, Inc.| (default, Mar 29 2018, 13:32:41) [MSC v.1900 64 bit (AMD64)]

platform.platform():
Windows-10-10.0.17134-SP0

where jupyter:
C:\Users\HP\Anaconda3\Scripts\jupyter.exe

pip list:
Package Version
---------------------------------- ---------
absl-py 0.3.0
alabaster 0.7.10
anaconda-client 1.6.14
anaconda-navigator 1.8.7
anaconda-project 0.8.2
asn1crypto 0.24.0
astor 0.7.1
astroid 1.6.3
astropy 3.0.2
attrs 18.1.0
Babel 2.5.3
backcall 0.1.0
backports.shutil-get-terminal-size 1.0.0
beautifulsoup4 4.6.0
bitarray 0.8.1
bkcharts 0.2
blaze 0.11.3
bleach 2.1.3
bokeh 0.12.16
boto 2.48.0
Bottleneck 1.2.1
certifi 2018.4.16
cffi 1.11.5
chardet 3.0.4
click 6.7
cloudpickle 0.5.3
clyent 1.2.2
colorama 0.3.9
comtypes 1.1.4
conda 4.5.4
conda-build 3.10.5
conda-verify 2.0.0
contextlib2 0.5.5
cryptography 2.2.2
cycler 0.10.0
Cython 0.28.2
cytoolz 0.9.0.1
dask 0.17.5
datashape 0.5.4
decorator 4.3.0
distributed 1.21.8
docutils 0.14
entrypoints 0.2.3
et-xmlfile 1.0.1
fastcache 1.0.2
filelock 3.0.4
Flask 1.0.2
Flask-Cors 3.0.4
gast 0.2.0
gevent 1.3.0
glob2 0.6
greenlet 0.4.13
grpcio 1.14.1
h5py 2.7.1
heapdict 1.0.0
html5lib 1.0.1
idna 2.6
imageio 2.3.0
imagesize 1.0.0
ipykernel 4.8.2
ipython 6.4.0
ipython-genutils 0.2.0
ipywidgets 7.2.1
isort 4.3.4
itsdangerous 0.24
jdcal 1.4
jedi 0.12.0
Jinja2 2.10
jsonschema 2.6.0
jupyter 1.0.0
jupyter-client 5.2.3
jupyter-console 5.2.0
jupyter-core 4.4.0
jupyterlab 0.32.1
jupyterlab-launcher 0.10.5
kiwisolver 1.0.1
lazy-object-proxy 1.3.1
llvmlite 0.23.1
locket 0.2.0
lxml 4.2.1
Markdown 2.6.11
MarkupSafe 1.0
matplotlib 2.2.2
mccabe 0.6.1
menuinst 1.4.14
mistune 0.8.3
mkl-fft 1.0.0
mkl-random 1.0.1
more-itertools 4.1.0
mpmath 1.0.0
msgpack-python 0.5.6
multipledispatch 0.5.0
navigator-updater 0.2.1
nbconvert 5.3.1
nbformat 4.4.0
networkx 2.1
nltk 3.3
nose 1.3.7
notebook 5.5.0
numba 0.38.0
numexpr 2.6.5
numpy 1.14.3
numpydoc 0.8.0
odo 0.5.1
olefile 0.45.1
openpyxl 2.5.3
packaging 17.1
pandas 0.23.0
pandocfilters 1.4.2
parso 0.2.0
partd 0.3.8
path.py 11.0.1
pathlib2 2.3.2
patsy 0.5.0
pep8 1.7.1
pickleshare 0.7.4
Pillow 5.1.0
pip 18.0
pkginfo 1.4.2
pluggy 0.6.0
ply 3.11
prompt-toolkit 1.0.15
protobuf 3.6.0
psutil 5.4.5
py 1.5.3
pycodestyle 2.4.0
pycosat 0.6.3
pycparser 2.18
pycrypto 2.6.1
pycurl 7.43.0.1
pyflakes 1.6.0
Pygments 2.2.0
pylint 1.8.4
pyodbc 4.0.23
pyOpenSSL 18.0.0
pyparsing 2.2.0
PySocks 1.6.8
pytest 3.5.1
pytest-arraydiff 0.2
pytest-astropy 0.3.0
pytest-doctestplus 0.1.3
pytest-openfiles 0.3.0
pytest-remotedata 0.2.1
python-dateutil 2.7.3
pytz 2018.4
PyWavelets 0.5.2
pywin32 223
pywinpty 0.5.1
PyYAML 3.12
pyzmq 17.0.0
QtAwesome 0.4.4
qtconsole 4.3.1
QtPy 1.4.1
requests 2.18.4
rope 0.10.7
ruamel-yaml 0.15.35
scikit-image 0.13.1
scikit-learn 0.19.1
scipy 1.1.0
seaborn 0.8.1
Send2Trash 1.5.0
setuptools 39.1.0
simplegeneric 0.8.1
singledispatch 3.4.0.3
six 1.11.0
sklearn 0.0
snowballstemmer 1.2.1
sortedcollections 0.6.1
sortedcontainers 1.5.10
Sphinx 1.7.4
sphinxcontrib-websupport 1.0.1
spyder 3.2.8
SQLAlchemy 1.2.7
statsmodels 0.9.0
sympy 1.1.1
tables 3.4.3
tblib 1.3.2
tensorboard 1.10.0
tensorflow 1.10.0
termcolor 1.1.0
terminado 0.8.1
testpath 0.3.1
toolz 0.9.0
tornado 5.0.2
traitlets 4.3.2
typing 3.6.4
unicodecsv 0.14.1
urllib3 1.22
wcwidth 0.1.7
webencodings 0.5.1
Werkzeug 0.14.1
wheel 0.31.1
widgetsnbextension 3.2.1
win-inet-pton 1.0.1
win-unicode-console 0.5
wincertstore 0.2
wrapt 1.10.11
xlrd 1.1.0
XlsxWriter 1.0.4
xlwings 0.11.8
xlwt 1.3.0
zict 0.1.3

conda list:
# packages in environment at C:\Users\HP\Anaconda3:
#
# Name Version Build Channel
_ipyw_jlab_nb_ext_conf 0.1.0 py36he6757f0_0
absl-py 0.3.0
alabaster 0.7.10 py36hcd07829_0
anaconda 5.2.0 py36_3
anaconda-client 1.6.14 py36_0
anaconda-navigator 1.8.7 py36_0
anaconda-project 0.8.2 py36hfad2e28_0
asn1crypto 0.24.0 py36_0
astor 0.7.1
astroid 1.6.3 py36_0
astropy 3.0.2 py36h452e1ab_1
attrs 18.1.0 py36_0
babel 2.5.3 py36_0
backcall 0.1.0 py36_0
backports 1.0 py36h81696a8_1
backports.shutil_get_terminal_size 1.0.0 py36h79ab834_2
beautifulsoup4 4.6.0 py36hd4cc5e8_1
bitarray 0.8.1 py36hfa6e2cd_1
bkcharts 0.2 py36h7e685f7_0
blas 1.0 mkl
blaze 0.11.3 py36h8a29ca5_0
bleach 2.1.3 py36_0
blosc 1.14.3 he51fdeb_0
bokeh 0.12.16 py36_0
boto 2.48.0 py36h1a776d2_1
bottleneck 1.2.1 py36hd119dfa_0
bzip2 1.0.6 hfa6e2cd_5
ca-certificates 2018.03.07 0
certifi 2018.4.16 py36_0
cffi 1.11.5 py36h945400d_0
chardet 3.0.4 py36h420ce6e_1
click 6.7 py36hec8c647_0
cloudpickle 0.5.3 py36_0
clyent 1.2.2 py36hb10d595_1
colorama 0.3.9 py36h029ae33_0
comtypes 1.1.4 py36_0
conda 4.5.4 py36_0
conda-build 3.10.5 py36_0
conda-env 2.6.0 h36134e3_1
conda-verify 2.0.0 py36h065de53_0
console_shortcut 0.1.1 h6bb2dd7_3
contextlib2 0.5.5 py36he5d52c0_0
cryptography 2.2.2 py36hfa6e2cd_0
curl 7.60.0 h7602738_0
cycler 0.10.0 py36h009560c_0
cython 0.28.2 py36hfa6e2cd_0
cytoolz 0.9.0.1 py36hfa6e2cd_0
dask 0.17.5 py36_0
dask-core 0.17.5 py36_0
datashape 0.5.4 py36h5770b85_0
decorator 4.3.0 py36_0
distributed 1.21.8 py36_0
docutils 0.14 py36h6012d8f_0
entrypoints 0.2.3 py36hfd66bb0_2
et_xmlfile 1.0.1 py36h3d2d736_0
fastcache 1.0.2 py36hfa6e2cd_2
filelock 3.0.4 py36_0
flask 1.0.2 py36_1
flask-cors 3.0.4 py36_0
freetype 2.8 h51f8f2c_1
gast 0.2.0
get_terminal_size 1.0.0 h38e98db_0
gevent 1.3.0 py36hfa6e2cd_0
glob2 0.6 py36hdf76b57_0
greenlet 0.4.13 py36hfa6e2cd_0
grpcio 1.14.1
h5py 2.7.1 py36h3bdd7fb_2
hdf5 1.10.2 hac2f561_1
heapdict 1.0.0 py36_2
html5lib 1.0.1 py36h047fa9f_0
icc_rt 2017.0.4 h97af966_0
icu 58.2 ha66f8fd_1
idna 2.6 py36h148d497_1
imageio 2.3.0 py36_0
imagesize 1.0.0 py36_0
intel-openmp 2018.0.0 8
ipykernel 4.8.2 py36_0
ipython 6.4.0 py36_0
ipython_genutils 0.2.0 py36h3c5d0ee_0
ipywidgets 7.2.1 py36_0
isort 4.3.4 py36_0
itsdangerous 0.24 py36hb6c5a24_1
jdcal 1.4 py36_0
jedi 0.12.0 py36_1
jinja2 2.10 py36h292fed1_0
jpeg 9b hb83a4c4_2
jsonschema 2.6.0 py36h7636477_0
jupyter 1.0.0 py36_4
jupyter_client 5.2.3 py36_0
jupyter_console 5.2.0 py36h6d89b47_1
jupyter_core 4.4.0 py36h56e9d50_0
jupyterlab 0.32.1 py36_0
jupyterlab_launcher 0.10.5 py36_0
kiwisolver 1.0.1 py36h12c3424_0
lazy-object-proxy 1.3.1 py36hd1c21d2_0
libcurl 7.60.0 hc4dcbb0_0
libiconv 1.15 h1df5818_7
libpng 1.6.34 h79bbb47_0
libsodium 1.0.16 h9d3ae62_0
libssh2 1.8.0 hd619d38_4
libtiff 4.0.9 hb8ad9f9_1
libxml2 2.9.8 hadb2253_1
libxslt 1.1.32 hf6f1972_0
llvmlite 0.23.1 py36hcacf6c6_0
locket 0.2.0 py36hfed976d_1
lxml 4.2.1 py36heafd4d3_0
lzo 2.10 h6df0209_2
m2w64-gcc-libgfortran 5.3.0 6
m2w64-gcc-libs 5.3.0 7
m2w64-gcc-libs-core 5.3.0 7
m2w64-gmp 6.1.0 2
m2w64-libwinpthread-git 5.0.0.4634.697f757 2
Markdown 2.6.11
markupsafe 1.0 py36h0e26971_1
matplotlib 2.2.2 py36h153e9ff_1
mccabe 0.6.1 py36hb41005a_1
menuinst 1.4.14 py36hfa6e2cd_0
mistune 0.8.3 py36hfa6e2cd_1
mkl 2018.0.2 1
mkl-service 1.1.2 py36h57e144c_4
mkl_fft 1.0.1 py36h452e1ab_0
mkl_random 1.0.1 py36h9258bd6_0
more-itertools 4.1.0 py36_0
mpmath 1.0.0 py36hacc8adf_2
msgpack-python 0.5.6 py36he980bc4_0
msys2-conda-epoch 20160418 1
multipledispatch 0.5.0 py36_0
navigator-updater 0.2.1 py36_0
nbconvert 5.3.1 py36h8dc0fde_0
nbformat 4.4.0 py36h3a5bc1b_0
networkx 2.1 py36_0
nltk 3.3.0 py36_0
nose 1.3.7 py36h1c3779e_2
notebook 5.5.0 py36_0
numba 0.38.0 py36h830ac7b_0
numexpr 2.6.5 py36hcd2f87e_0
numpy 1.14.3 py36h9fa60d3_1
numpy-base 1.14.3 py36h555522e_1
numpydoc 0.8.0 py36_0
odo 0.5.1 py36h7560279_0
olefile 0.45.1 py36_0
openpyxl 2.5.3 py36_0
openssl 1.0.2o h8ea7d77_0
packaging 17.1 py36_0
pandas 0.23.0 py36h830ac7b_0
pandoc 1.19.2.1 hb2460c7_1
pandocfilters 1.4.2 py36h3ef6317_1
parso 0.2.0 py36_0
partd 0.3.8 py36hc8e763b_0
path.py 11.0.1 py36_0
pathlib2 2.3.2 py36_0
patsy 0.5.0 py36_0
pep8 1.7.1 py36_0
pickleshare 0.7.4 py36h9de030f_0
pillow 5.1.0 py36h0738816_0
pip 10.0.1 py36_0
pip 18.0
pkginfo 1.4.2 py36_1
pluggy 0.6.0 py36hc7daf1e_0
ply 3.11 py36_0
prompt_toolkit 1.0.15 py36h60b8f86_0
protobuf 3.6.0
psutil 5.4.5 py36hfa6e2cd_0
py 1.5.3 py36_0
pycodestyle 2.4.0 py36_0
pycosat 0.6.3 py36h413d8a4_0
pycparser 2.18 py36hd053e01_1
pycrypto 2.6.1 py36hfa6e2cd_8
pycurl 7.43.0.1 py36h74b6da3_0
pyflakes 1.6.0 py36h0b975d6_0
pygments 2.2.0 py36hb010967_0
pylint 1.8.4 py36_0
pyodbc 4.0.23 py36h6538335_0
pyopenssl 18.0.0 py36_0
pyparsing 2.2.0 py36h785a196_1
pyqt 5.9.2 py36h1aa27d4_0
pysocks 1.6.8 py36_0
pytables 3.4.3 py36he6f6034_1
pytest 3.5.1 py36_0
pytest-arraydiff 0.2 py36_0
pytest-astropy 0.3.0 py36_0
pytest-doctestplus 0.1.3 py36_0
pytest-openfiles 0.3.0 py36_0
pytest-remotedata 0.2.1 py36_0
python 3.6.5 h0c2934d_0
python-dateutil 2.7.3 py36_0
pytz 2018.4 py36_0
pywavelets 0.5.2 py36hc649158_0
pywin32 223 py36hfa6e2cd_1
pywinpty 0.5.1 py36_0
pyyaml 3.12 py36h1d1928f_1
pyzmq 17.0.0 py36hfa6e2cd_1
qt 5.9.5 vc14he4a7d60_0 [vc14]
qtawesome 0.4.4 py36h5aa48f6_0
qtconsole 4.3.1 py36h99a29a9_0
qtpy 1.4.1 py36_0
requests 2.18.4 py36h4371aae_1
rope 0.10.7 py36had63a69_0
ruamel_yaml 0.15.35 py36hfa6e2cd_1
scikit-image 0.13.1 py36hfa6e2cd_1
scikit-learn 0.19.1 py36h53aea1b_0
scipy 1.1.0 py36h672f292_0
seaborn 0.8.1 py36h9b69545_0
send2trash 1.5.0 py36_0
setuptools 39.1.0 py36_0
simplegeneric 0.8.1 py36_2
singledispatch 3.4.0.3 py36h17d0c80_0
sip 4.19.8 py36h6538335_0
six 1.11.0 py36h4db2310_1
sklearn 0.0
snappy 1.1.7 h777316e_3
snowballstemmer 1.2.1 py36h763602f_0
sortedcollections 0.6.1 py36_0
sortedcontainers 1.5.10 py36_0
sphinx 1.7.4 py36_0
sphinxcontrib 1.0 py36hbbac3d2_1
sphinxcontrib-websupport 1.0.1 py36hb5e5916_1
spyder 3.2.8 py36_0
spyder 2.2.0
sqlalchemy 1.2.7 py36ha85dd04_0
sqlite 3.23.1 h35aae40_0
statsmodels 0.9.0 py36h452e1ab_0
sympy 1.1.1 py36h96708e0_0
tblib 1.3.2 py36h30f5020_0
tensorboard 1.10.0
tensorflow 1.10.0
termcolor 1.1.0
terminado 0.8.1 py36_1
testpath 0.3.1 py36h2698cfe_0
tk 8.6.7 hcb92d03_3
toolz 0.9.0 py36_0
tornado 5.0.2 py36_0
traitlets 4.3.2 py36h096827d_0
typing 3.6.4 py36_0
unicodecsv 0.14.1 py36h6450c06_0
urllib3 1.22 py36h276f60a_0
vc 14 h0510ff6_3
vs2015_runtime 14.0.25123 3
wcwidth 0.1.7 py36h3d5aa90_0
webencodings 0.5.1 py36h67c50ae_1
werkzeug 0.14.1 py36_0
wheel 0.31.1 py36_0
widgetsnbextension 3.2.1 py36_0
win_inet_pton 1.0.1 py36he67d7fd_1
win_unicode_console 0.5 py36hcdbd4b5_0
wincertstore 0.2 py36h7fe50ca_0
winpty 0.4.3 4
wrapt 1.10.11 py36he5f5981_0
xlrd 1.1.0 py36h1cb58dc_1
xlsxwriter 1.0.4 py36_0
xlwings 0.11.8 py36_0
xlwt 1.3.0 py36h1a4751e_0
yaml 0.1.7 hc54c509_2
zeromq 4.2.5 hc6251cf_0
zict 0.1.3 py36h2d8e73e_0
zlib 1.2.11 h8395fce_2

Tried some measures:

• Tried installing python3 kernel, but the problem persists for the same (Deleted as it does not worked at all).
• Tried disabling all the windows defenders (did not worked).
• Opening in other browser.
• Tried reinstalling several times (really and it did not worked).
• Tried all measures mentioned at Jupyter Notebook 5.6.0 documentation.

It looks like there is a problem in system (i.e. hardware). Is it?

[eofal]

I was helped by the complete removal and clean installation of Anaconda

[azizullah2017]

pip install 'ipykernel<5.0.0'

#4050

[jishanshaikh4]

pip install 'ipykernel<5.0.0'

#4050

The problem was not that of hardware, there was something that cannot be resolved. I then change my operating system (I used to do it frequently) from Ubuntu 17.10 to Kali linux (Plasma KDE). Now, it works perfectly fine for me.

Thanks for the solution by the way.

[Viswalahiri]

Most likely cause is a failure to properly establish the websocket connection. The root cause of that on Windows can be bad firewalls or AV software. One option is to specify jupyter notebook --ip 127.0.0.1 in the Anaconda Prompt to force localhost-by-ip instead of by name. That works on some systems.

[somraj30]

pip install 'ipykernel<5.0.0'

#4050

The system cannot find the file specified.