Error 500

[nitrosx]

Describe the bug

When running your example.ipynb, I get the following error:

from jupyterlab_h5web import H5Web

H5Web('simple.h5')

Request failed with status code 500

To Reproduce

1. run jupyter lab
2. open the notebook example.ipynb
3. run the first two cells

Expected behaviour

It should present the widget

Context

• OS: LinuxMint
• Browser: Firefox
• Version: 110 64bits
• JupyterLab version: 3.5.3
• Python: 3.10
• conda environment

Extension lists

> jupyter labextension list
JupyterLab v3.5.3
/home/nitrosx71/miniconda3/envs/SE/share/jupyter/labextensions
        jupyterlab-h5web v7.0.0 enabled OK (python, jupyterlab_h5web)

> jupyter serverextension list
config dir: /home/nitrosx71/miniconda3/envs/SE/etc/jupyter
    jupyterlab  enabled 
    - Validating...
      jupyterlab 3.5.3 OK
    jupyterlab_h5web  enabled 
    - Validating...
      jupyterlab_h5web 7.0.0 OK

[loichuder]

Hm, that's odd. It works fine on my end with the same version of jupyterlab.

Do you open JupyterLab by running jupyter lab in a terminal ? If so, do you have additional info in the log displayed in the terminal about the reason of the error 500 ?

[yurirtonin]

I had a similar issue with a simple dummy file I created. The terminal log complained about the HDF version.

[t20100]

It's related to the version of libhdf5 in used that does not support the "file locking" feature:

locking – The file locking behavior. One of:
[...]
Only available with HDF5 >= 1.12.1 or 1.10.x >= 1.10.7.

See https://docs.h5py.org/en/stable/high/file.html#h5py.File

You can check the version of libhdf5 with h5py.version.hdf5_version.