500 : Internal Server Error

[m-albert]

I'm getting this error, even after updating pygments.

~/misc_notebooks$ voila test.ipynb
[Voila] Using /tmp to store connection files
[Voila] Storing connection files in /tmp/voila_f3lul4ru.
[Voila] Serving static files from /home/malbert/miniconda3/envs/voila/lib/python3.7/site-packages/voila/static.
[Voila] Voila is running at:
http://localhost:8866/
[Voila] WARNING | No web browser found: could not locate runnable browser.
[Voila] WARNING | Notebook cake_fusion_function.ipynb is not trusted
[Voila] Kernel started: e8018fad-8a34-4b2d-a8f6-0d97d04ce0aa
[Voila] Executing notebook with kernel:
ERROR:tornado.application:Uncaught exception GET / (10.11.63.205)
HTTPServerRequest(protocol='http', host='elvis:8866', method='GET', uri='/', version='HTTP/1.1', remote_ip='10.11.63.205')
Traceback (most recent call last):
File "/home/malbert/miniconda3/envs/voila/lib/python3.7/site-packages/tornado/web.py", line 1699, in _execute
result = await result
File "/home/malbert/miniconda3/envs/voila/lib/python3.7/site-packages/tornado/gen.py", line 748, in run
yielded = self.gen.send(value)
File "/home/malbert/miniconda3/envs/voila/lib/python3.7/site-packages/voila/handler.py", line 60, in get
result = executenb(notebook, km=km, cwd=cwd)
File "/home/malbert/miniconda3/envs/voila/lib/python3.7/site-packages/voila/execute.py", line 133, in executenb
return ep.preprocess(nb, resources, km=km)[0]
File "/home/malbert/miniconda3/envs/voila/lib/python3.7/site-packages/voila/execute.py", line 88, in preprocess
result = super(ExecutePreprocessorWithOutputWidget, self).preprocess(nb, resources=resources, km=km)
File "/home/malbert/miniconda3/envs/voila/lib/python3.7/site-packages/nbconvert/preprocessors/execute.py", line 381, in preprocess
nb, resources = super(ExecutePreprocessor, self).preprocess(nb, resources)
File "/home/malbert/miniconda3/envs/voila/lib/python3.7/site-packages/nbconvert/preprocessors/base.py", line 69, in preprocess
nb.cells[index], resources = self.preprocess_cell(cell, resources, index)
File "/home/malbert/miniconda3/envs/voila/lib/python3.7/site-packages/nbconvert/preprocessors/execute.py", line 414, in preprocess_cell
reply, outputs = self.run_cell(cell, cell_index)
File "/home/malbert/miniconda3/envs/voila/lib/python3.7/site-packages/nbconvert/preprocessors/execute.py", line 516, in run_cell
self.process_message(msg, cell, cell_index)
File "/home/malbert/miniconda3/envs/voila/lib/python3.7/site-packages/nbconvert/preprocessors/execute.py", line 569, in process_message
self.handle_comm_msg(cell.outputs, msg, cell_index)
File "/home/malbert/miniconda3/envs/voila/lib/python3.7/site-packages/voila/execute.py", line 107, in handle_comm_msg
state = data['state']
KeyError: 'state'
ERROR:tornado.general:Could not open static file '/base/images/favicon.ico'
ERROR:tornado.general:Could not open static file '/style/style.min.css'
ERROR:tornado.access:500 GET / (10.11.63.205) 1356.58ms

output of pip list:

attrs 19.1.0
backcall 0.1.0
bleach 3.1.0
certifi 2019.6.16
cycler 0.10.0
decorator 4.4.0
defusedxml 0.5.0
entrypoints 0.3
ipykernel 5.1.1
ipython 7.6.1
ipython-genutils 0.2.0
jedi 0.14.1
Jinja2 2.10.1
jsonschema 3.0.1
jupyter-client 5.3.1
jupyter-core 4.4.0
jupyter-server 0.0.5
jupyterlab-pygments 0.1.0
kiwisolver 1.1.0
MarkupSafe 1.1.1
matplotlib 3.1.0
mistune 0.8.4
mkl-fft 1.0.12
mkl-random 1.0.2
nbconvert 5.5.0
nbformat 4.4.0
numpy 1.16.4
pandocfilters 1.4.2
parso 0.5.1
pexpect 4.7.0
pickleshare 0.7.5
pip 19.1.1
prometheus-client 0.7.1
prompt-toolkit 2.0.9
ptyprocess 0.6.0
Pygments 2.4.2
pyparsing 2.4.0
pyrsistent 0.15.3
python-dateutil 2.8.0
pytz 2019.1
pyzmq 18.0.2
scipy 1.2.1
Send2Trash 1.5.0
setuptools 41.0.1
six 1.12.0
terminado 0.8.2
testpath 0.4.2
tornado 6.0.3
traitlets 4.3.2
voila 0.1.7
wcwidth 0.1.7
webencodings 0.5.1
wheel 0.33.4

Thanks for any hints!

[maartenbreddels]

I think this is a duplicate of #311
If you could share your notebook, that would be great!