Voila: 500: Internal Server Error

Created on 12 Jun 2019 · 23Comments · Source: voila-dashboards/voila

Constantly getting this error - tried updating nbconvert, renaming filename nothing changed

[I 15:33:00.226 NotebookApp] Executing notebook with kernel:
[E 15:33:05.055 NotebookApp] Uncaught exception GET /voila/render/packt/Pycon_Ticket.ipynb (127.0.0.1)
    HTTPServerRequest(protocol='http', host='localhost:8888', method='GET', uri='/voila/render/packt/Pycon_Ticket.ipynb', version='HTTP/1.1', remote_ip='127.0.0.1')
    Traceback (most recent call last):
      File "/usr/local/lib/python3.7/site-packages/tornado/web.py", line 1592, in _execute
        result = yield result
      File "/usr/local/lib/python3.7/site-packages/tornado/gen.py", line 1133, in run
        value = future.result()
      File "/usr/local/lib/python3.7/site-packages/tornado/gen.py", line 1147, in run
        yielded = self.gen.send(value)
      File "/usr/local/lib/python3.7/site-packages/voila/handler.py", line 72, in get
        contents_manager=self.contents_manager  # for the image inlining
      File "/usr/local/lib/python3.7/site-packages/nbconvert/exporters/templateexporter.py", line 255, in __init__
        super(TemplateExporter, self).__init__(config=config, **kw)
      File "/usr/local/lib/python3.7/site-packages/nbconvert/exporters/exporter.py", line 110, in __init__
        self._init_preprocessors()
      File "/usr/local/lib/python3.7/site-packages/nbconvert/exporters/exporter.py", line 264, in _init_preprocessors
        self.register_preprocessor(preprocessor, enabled=True)
      File "/usr/local/lib/python3.7/site-packages/nbconvert/exporters/exporter.py", line 225, in register_preprocessor
        preprocessor_cls = import_item(preprocessor)
      File "/usr/local/lib/python3.7/site-packages/traitlets/utils/importstring.py", line 34, in import_item
        module = __import__(package, fromlist=[obj])
      File "/usr/local/lib/python3.7/site-packages/voila/csspreprocessor.py", line 13, in <module>
        from jupyterlab_pygments import JupyterStyle
      File "/usr/local/lib/python3.7/site-packages/jupyterlab_pygments/__init__.py", line 9, in <module>
        from .style import JupyterStyle
      File "/usr/local/lib/python3.7/site-packages/jupyterlab_pygments/style.py", line 15, in <module>
        class JupyterStyle(Style):
      File "/usr/local/lib/python3.7/site-packages/pygments/style.py", line 101, in __new__
        ndef[0] = colorformat(styledef)
      File "/usr/local/lib/python3.7/site-packages/pygments/style.py", line 58, in colorformat
        assert False, "wrong color format %r" % text
    AssertionError: wrong color format 'var(--jp-mirror-editor-variable-color)'
[E 15:33:05.058 NotebookApp] {
      "Host": "localhost:8888",
      "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:67.0) Gecko/20100101 Firefox/67.0",
      "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
      "Accept-Language": "en-US,en;q=0.5",
      "Accept-Encoding": "gzip, deflate",
      "Referer": "http://localhost:8888/notebooks/packt/Pycon_Ticket.ipynb",
      "Dnt": "1",
      "Connection": "keep-alive",
      "Cookie": "_xsrf=2|58f1b068|28140c23837c9512d832e3525966c02b|1558249854; username-localhost-8889=\"2|1:0|10:1558261312|23:username-localhost-8889|44:ZGY5YWNhYmVkNTQ2NDY5MmJjY2FmNzI5NzZlM2U0ZTA=|e44adcd433daffd52741d26d35ef82693f7e80bafd9ad5e57242a3196b84a894\"; username-localhost-8890=\"2|1:0|10:1559121785|23:username-localhost-8890|44:ODE4NDdhYmVhZjhhNGU4ZjkxZmZjMDk0NTQ5ZjRhMWQ=|35bac91886588eed67589be98fd75dc1e9ad61fc2b7004b8565ed8ef4bf44ee8\"; username-localhost-8888=\"2|1:0|10:1560333659|23:username-localhost-8888|44:NmRkZjg4MDY1ZDdlNDZmZjk2ZWI0YjczZjI5MjUzMjE=|158d33324e7cfe485b555743e5ced9dba2505856e543317dd5a7cd2bc9fdd3e0\"",
      "Upgrade-Insecure-Requests": "1"
    }
[E 15:33:05.058 NotebookApp] 500 GET /voila/render/packt/Pycon_Ticket.ipynb (127.0.0.1) 6264.64ms referer=http://localhost:8888/notebooks/packt/Pycon_Ticket.ipynb

Source

amrrs

👍7

Most helpful comment

Trying at Command-level leaves me with this error.

voila tiobeindexpy.ipynb
[Voila] Using /var/folders/j5/272v_6t54dz6mdgg51h5wnsm0000gn/T to store connection files
[Voila] Storing connection files in /var/folders/j5/272v_6t54dz6mdgg51h5wnsm0000gn/T/voila_xfu6nh0s.
[Voila] Serving static files from /usr/local/lib/python3.7/site-packages/voila/static.
[Voila] Voila is running at:
http://localhost:8866/
[Voila] Kernel started: 0d52332c-6cd9-4d87-8dd3-fa9e409a0111
[Voila] Executing notebook with kernel:
ERROR:tornado.application:Uncaught exception GET / (127.0.0.1)
HTTPServerRequest(protocol='http', host='localhost:8866', method='GET', uri='/', version='HTTP/1.1', remote_ip='127.0.0.1')
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/tornado/web.py", line 1592, in _execute
    result = yield result
  File "/usr/local/lib/python3.7/site-packages/tornado/gen.py", line 1133, in run
    value = future.result()
  File "/usr/local/lib/python3.7/site-packages/tornado/gen.py", line 1147, in run
    yielded = self.gen.send(value)
  File "/usr/local/lib/python3.7/site-packages/voila/handler.py", line 72, in get
    contents_manager=self.contents_manager  # for the image inlining
  File "/usr/local/lib/python3.7/site-packages/nbconvert/exporters/templateexporter.py", line 255, in __init__
    super(TemplateExporter, self).__init__(config=config, **kw)
  File "/usr/local/lib/python3.7/site-packages/nbconvert/exporters/exporter.py", line 110, in __init__
    self._init_preprocessors()
  File "/usr/local/lib/python3.7/site-packages/nbconvert/exporters/exporter.py", line 264, in _init_preprocessors
    self.register_preprocessor(preprocessor, enabled=True)
  File "/usr/local/lib/python3.7/site-packages/nbconvert/exporters/exporter.py", line 225, in register_preprocessor
    preprocessor_cls = import_item(preprocessor)
  File "/usr/local/lib/python3.7/site-packages/traitlets/utils/importstring.py", line 34, in import_item
    module = __import__(package, fromlist=[obj])
  File "/usr/local/lib/python3.7/site-packages/voila/csspreprocessor.py", line 13, in <module>
    from jupyterlab_pygments import JupyterStyle
  File "/usr/local/lib/python3.7/site-packages/jupyterlab_pygments/__init__.py", line 9, in <module>
    from .style import JupyterStyle
  File "/usr/local/lib/python3.7/site-packages/jupyterlab_pygments/style.py", line 15, in <module>
    class JupyterStyle(Style):
  File "/usr/local/lib/python3.7/site-packages/pygments/style.py", line 101, in __new__
    ndef[0] = colorformat(styledef)
  File "/usr/local/lib/python3.7/site-packages/pygments/style.py", line 58, in colorformat
    assert False, "wrong color format %r" % text
AssertionError: wrong color format 'var(--jp-mirror-editor-variable-color)'
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 / (127.0.0.1) 11032.48ms

amrrs on 12 Jun 2019

👍4

All 23 comments

Trying at Command-level leaves me with this error.

voila tiobeindexpy.ipynb
[Voila] Using /var/folders/j5/272v_6t54dz6mdgg51h5wnsm0000gn/T to store connection files
[Voila] Storing connection files in /var/folders/j5/272v_6t54dz6mdgg51h5wnsm0000gn/T/voila_xfu6nh0s.
[Voila] Serving static files from /usr/local/lib/python3.7/site-packages/voila/static.
[Voila] Voila is running at:
http://localhost:8866/
[Voila] Kernel started: 0d52332c-6cd9-4d87-8dd3-fa9e409a0111
[Voila] Executing notebook with kernel:
ERROR:tornado.application:Uncaught exception GET / (127.0.0.1)
HTTPServerRequest(protocol='http', host='localhost:8866', method='GET', uri='/', version='HTTP/1.1', remote_ip='127.0.0.1')
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/tornado/web.py", line 1592, in _execute
    result = yield result
  File "/usr/local/lib/python3.7/site-packages/tornado/gen.py", line 1133, in run
    value = future.result()
  File "/usr/local/lib/python3.7/site-packages/tornado/gen.py", line 1147, in run
    yielded = self.gen.send(value)
  File "/usr/local/lib/python3.7/site-packages/voila/handler.py", line 72, in get
    contents_manager=self.contents_manager  # for the image inlining
  File "/usr/local/lib/python3.7/site-packages/nbconvert/exporters/templateexporter.py", line 255, in __init__
    super(TemplateExporter, self).__init__(config=config, **kw)
  File "/usr/local/lib/python3.7/site-packages/nbconvert/exporters/exporter.py", line 110, in __init__
    self._init_preprocessors()
  File "/usr/local/lib/python3.7/site-packages/nbconvert/exporters/exporter.py", line 264, in _init_preprocessors
    self.register_preprocessor(preprocessor, enabled=True)
  File "/usr/local/lib/python3.7/site-packages/nbconvert/exporters/exporter.py", line 225, in register_preprocessor
    preprocessor_cls = import_item(preprocessor)
  File "/usr/local/lib/python3.7/site-packages/traitlets/utils/importstring.py", line 34, in import_item
    module = __import__(package, fromlist=[obj])
  File "/usr/local/lib/python3.7/site-packages/voila/csspreprocessor.py", line 13, in <module>
    from jupyterlab_pygments import JupyterStyle
  File "/usr/local/lib/python3.7/site-packages/jupyterlab_pygments/__init__.py", line 9, in <module>
    from .style import JupyterStyle
  File "/usr/local/lib/python3.7/site-packages/jupyterlab_pygments/style.py", line 15, in <module>
    class JupyterStyle(Style):
  File "/usr/local/lib/python3.7/site-packages/pygments/style.py", line 101, in __new__
    ndef[0] = colorformat(styledef)
  File "/usr/local/lib/python3.7/site-packages/pygments/style.py", line 58, in colorformat
    assert False, "wrong color format %r" % text
AssertionError: wrong color format 'var(--jp-mirror-editor-variable-color)'
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 / (127.0.0.1) 11032.48ms

amrrs on 12 Jun 2019

👍4

Same issue.

johntfoster on 12 Jun 2019

@amrrs @johntfoster thanks for the report.

Which version of voila are you using and how did you install it?

jtpio on 12 Jun 2019

I'm using voila=0.1.2. I first installed via conda install -c conda-forge voila into a clean conda environment. I also tried pip install voila. Had the same error both times.

johntfoster on 12 Jun 2019

@amrrs updating pygments to the latest version should fix that issue.

For some reason you don't seem to have the required version, that is >=2.4.1.

SylvainCorlay on 12 Jun 2019

👍3

@johntfoster are you seeing exactly the same error message in the console, or some issue related to the execution of your notebook?

SylvainCorlay on 12 Jun 2019

❤1

Updating pygments did not resolve the issue. The error is in the console when running voila my_test_notebook.ipynb. The interactive widget works fine in the notebook. Console output is attached.

console.log

johntfoster on 12 Jun 2019

@SylvainCorlay - For me updating pygments solved the issue! Thank you!

amrrs on 12 Jun 2019

👍1

@johntfoster would you mind sharing the output of your pip install voila?

It would be interesting to see if you get something like the following:

ERROR: jupyterlab-pygments 0.1.0 has requirement pygments<3,>=2.4.1, but you'll have pygments 2.3.1 which is incompatible.

jtpio on 14 Jun 2019

experienced the same thing here...

marcelo-ventura on 14 Jun 2019

@marcelo-ventura. Please let us know the error that you are seeing in the console.

If the notebook failed to run for any reason (including an exception in your code or a missing package) you will get error 500.

SylvainCorlay on 14 Jun 2019

👍1

(base) path:notebooks marcelo$ voila bqplot.ipynb [Voila] Using /var/folders/t7/j6n0jsqj35bf529gnf0tlm0r0000gn/T to store connection files [Voila] Storing connection files in /var/folders/t7/j6n0jsqj35bf529gnf0tlm0r0000gn/T/voila_qpk8c8mp. [Voila] Serving static files from /Users/marcelo/anaconda3/lib/python3.7/site-packages/voila/static. [Voila] Voila is running at: http://localhost:8866/ [Voila] WARNING | Notebook bqplot.ipynb is not trusted [Voila] Kernel started: 1c4720f3-8a0e-42d8-8d05-14481a0c8b2c [Voila] Executing notebook with kernel: ERROR:tornado.application:Uncaught exception GET / (127.0.0.1) HTTPServerRequest(protocol='http', host='localhost:8866', method='GET', uri='/', version='HTTP/1.1', remote_ip='127.0.0.1') Traceback (most recent call last): File "/Users/marcelo/anaconda3/lib/python3.7/site-packages/tornado/web.py", line 1699, in _execute result = await result File "/Users/marcelo/anaconda3/lib/python3.7/site-packages/tornado/gen.py", line 742, in run yielded = self.gen.send(value) File "/Users/marcelo/anaconda3/lib/python3.7/site-packages/voila/handler.py", line 72, in get contents_manager=self.contents_manager # for the image inlining File "/Users/marcelo/anaconda3/lib/python3.7/site-packages/nbconvert/exporters/templateexporter.py", line 255, in __init__ super(TemplateExporter, self).__init__(config=config, **kw) File "/Users/marcelo/anaconda3/lib/python3.7/site-packages/nbconvert/exporters/exporter.py", line 110, in __init__ self._init_preprocessors() File "/Users/marcelo/anaconda3/lib/python3.7/site-packages/nbconvert/exporters/exporter.py", line 264, in _init_preprocessors self.register_preprocessor(preprocessor, enabled=True) File "/Users/marcelo/anaconda3/lib/python3.7/site-packages/nbconvert/exporters/exporter.py", line 225, in register_preprocessor preprocessor_cls = import_item(preprocessor) File "/Users/marcelo/anaconda3/lib/python3.7/site-packages/traitlets/utils/importstring.py", line 34, in import_item module = __import__(package, fromlist=[obj]) File "/Users/marcelo/anaconda3/lib/python3.7/site-packages/voila/csspreprocessor.py", line 13, in <module> from jupyterlab_pygments import JupyterStyle File "/Users/marcelo/anaconda3/lib/python3.7/site-packages/jupyterlab_pygments/__init__.py", line 9, in <module> from .style import JupyterStyle File "/Users/marcelo/anaconda3/lib/python3.7/site-packages/jupyterlab_pygments/style.py", line 15, in <module> class JupyterStyle(Style): File "/Users/marcelo/anaconda3/lib/python3.7/site-packages/pygments/style.py", line 101, in __new__ ndef[0] = colorformat(styledef) File "/Users/marcelo/anaconda3/lib/python3.7/site-packages/pygments/style.py", line 58, in colorformat assert False, "wrong color format %r" % text AssertionError: wrong color format 'var(--jp-mirror-editor-variable-color)' 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 / (127.0.0.1) 3802.30ms ^C[Voila] Stopping... [Voila] Kernel shutdown: 1c4720f3-8a0e-42d8-8d05-14481a0c8b2c
@SylvainCorlay there you go!
btw experiencing error 500 in windows and macOS

marcelo-ventura on 14 Jun 2019

It worked after I installed a template....this could help you guys @amrrs @johntfoster !
After I run this...
pip install voila-gridstack
Then I can get bqplot.ipynb working.
This was useful: https://blog.jupyter.org/and-voilà-f6a2c08a4a93

marcelo-ventura on 14 Jun 2019

Ok @marcelo-ventura. The issue is that you need to update pygments to 2.4.1 at least.

SylvainCorlay on 14 Jun 2019

👍1

Ok @marcelo-ventura. The issue is that you need to update pygments to 2.4.1 at least.

I used pip install voila-gridstack and it worked....

marcelo-ventura on 14 Jun 2019

👍2

It probably updated pygments.

SylvainCorlay on 14 Jun 2019

👍2

Hello,

I'm tyring to work with Voilà on JupyterHub, always have 500 Internal error in big letters !
I tried to update pygments as suggested, and even installed voila-gridstack, still the same issue.
As I am not using JupyterHub with default port numbers, could this be an issue to Voilà rendering ?

Best

DYSpider13 on 20 Jun 2019

@DYSpider13 do you have access to the logs to see what is causing the 500 internal error?

Also maybe worth double checking the versions that are installed (with pip list or conda list)?

jtpio on 20 Jun 2019

Same static file and assertion errors:

$ pip list

jupyter              1.0.0   
jupyter-client       5.2.4   
jupyter-console      6.0.0   
jupyter-core         4.4.0   
jupyter-server       0.0.5   
jupyterhub           0.9.6   
jupyterlab           0.35.5  
jupyterlab-pygments  0.1.0   
jupyterlab-server    0.2.0

nbconvert            5.5.0 
Pygments             2.4.2 

voila                0.1.3   
voila-gridstack      0.0.4

errors

AssertionError: wrong color format 'var(--jp-mirror-editor-variable-color)'
ERROR:tornado.general:Could not open static file '/base/images/favicon.ico'
ERROR:tornado.general:Could not open static file '/style/style.min.css'

accessing via
http://localhost:8888/voila/render/1.%20Welcome.ipynb

*UPDATE
Restarted docker container and it worked. I'm guessing that the Tornado server is looking for paths when the container starts.

ghost on 2 Jul 2019

The issue with the assertion error in pygments occurs with pygments <2.4.1, while voila requires pygments >=2.4.1.

SylvainCorlay on 2 Jul 2019

The issue with the assertion error in pygments occurs with pygments <2.4.1, while voila requires pygments >=2.4.1.

SylvainCorlay on 2 Jul 2019

I'm still 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