Jupyter lab build fails in fresh conda environment

[ghost]

Description

Since I updated my Jupiterlab Enviroment to 1.0.2 I have a problem with my Jupyter Lab enviroment. The icons on the navigation bar are missing.

This error pops up intermittenly where the icons should be:
This page contains the following errors: error on line 1 at column 1: Document is empty

I cannot reproduce this issue in a clean environment. I already removed all my Jupter Lab extensions, did jupyter lab clean and jupyter lab build but still the same.

Context

Name Version Build Channel
jupyter 1.0.0 py37_7
jupyter-contrib-core 0.3.3 pypi_0 pypi
jupyter-contrib-nbextensions 0.5.1 pypi_0 pypi
jupyter-highlight-selected-word 0.2.0 pypi_0 pypi
jupyter-latex-envs 1.4.6 pypi_0 pypi
jupyter-nbextensions-configurator 0.4.1 pypi_0 pypi
jupyter_client 5.3.1 py_0
jupyter_console 6.0.0 py37_0
jupyter_core 4.5.0 py_0
jupyterlab 1.0.2 py37hf63ae98_0
jupyterlab-github 1.0.0 pypi_0 pypi
jupyterlab_server 1.0.0 py_1
jupyterthemes 0.20.0 pypi_0 pypi

[bmwilly]

I'm having the same problem. AFAICT, it only seems to occur if I add extensions or run jupyter lab build.

[flxai]

I just encountered the exact same error. I had some remaining JupyterLab directories after purging my Anaconda folder and just noticed that I still had an older JupyterLab version after the new Anaconda installation:

$ jupyter --version | grep lab
jupyter lab      : 1.0.2

Upgrading through pip to the newest version and rebuilding the assets worked for me:

$ pip install -U jupyterlab
[...]
$ jupyter --version | grep lab
jupyter lab      : 1.1.1
$ jupyter lab build
[...]

[blink1073]

Hi folks, we haven't yet tracked down the root cause but it appears to be a backwards incompatibility in one or more of the JavaScript packages in our 1.1 series. Once we identify the problem we will release a new set of 1.1 JS package(s) that are backward compatible. In the mean time, please use upgrade to the 1.1 series if possible. conda install -c conda-forge jupyterlab or pip install --upgrade jupyterlab.

[blink1073]

@telamonian, I think this one might be related to #6034 as well:

[blink1073]

To reproduce the above:

pip install jupyterlab==1.0.2
jupyter lab build
jupyter lab

[ghost]

I just encountered the exact same error. I had some remaining JupyterLab directories after purging my Anaconda folder and just noticed that I still had an older JupyterLab version after the new Anaconda installation:

$ jupyter --version | grep lab
jupyter lab      : 1.0.2

Upgrading through pip to the newest version and rebuilding the assets worked for me:

$ pip install -U jupyterlab
[...]
$ jupyter --version | grep lab
jupyter lab      : 1.1.1
$ jupyter lab build
[...]

This was the solution for my issue. Thank you very much! 😀

[jasongrout]

Original problem fixed by #7182