RuntimeError: JupyterLab failed to build

[javidsch]

It works on Windows 10/Anaconda(version=2019.10).

I've tried on AWS/Linux EC2, there was an issue.
Tested in two cases: on JupyterHub and on Jupyter notebok - the same result!
One point, I did it when JupyterHub and Jupyter was runnning, after failed I stooped and tried again - the same result!

Run command:
(base) []$ jupyter labextension install @jupyterlab/github
Building jupyterlab assets (build:prod:minimize)
An error occured.
RuntimeError: JupyterLab failed to build
See the log file for details: /tmp/jupyterlab-debug-te2pdi6d.log

From log file

node /home/ec2-user/anaconda3/lib/python3.7/site-packages/jupyterlab/staging/yarn.js yarn-deduplicate -s fewer
yarn run v1.15.2
$ /home/ec2-user/anaconda3/share/jupyter/lab/staging/node_modules/.bin/yarn-deduplicate -s fewer
Done in 1.02s.

node /home/ec2-user/anaconda3/lib/python3.7/site-packages/jupyterlab/staging/yarn.js run build:prod:minimize
yarn run v1.15.2
$ cross-env NODE_OPTIONS=--max_old_space_size=4096 webpack --config webpack.prod.minimize.config.js
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

JupyterLab failed to build
Traceback (most recent call last):

File "/home/ec2-user/anaconda3/lib/python3.7/site-packages/jupyterlab/debuglog.py", line 47, in debug_logging
yield

File "/home/ec2-user/anaconda3/lib/python3.7/site-packages/jupyterlab/labextensions.py", line 105, in start
core_config=self.core_config)

File "/home/ec2-user/anaconda3/lib/python3.7/site-packages/jupyterlab/commands.py", line 378, in build
command=command, clean_staging=clean_staging)

File "/home/ec2-user/anaconda3/lib/python3.7/site-packages/jupyterlab/commands.py", line 583, in build
raise RuntimeError(msg)

RuntimeError: JupyterLab failed to build

Exiting application: jupyter

[javidsch]

And now jupyter lab tries to build it... but fails...
https://imgur.com/a/lPZxCHC

[mripani]

Same issue

First I had this one:

Unable to communicate with the jupyterlab-dash JupyterLab extension.
Is this Python kernel running inside JupyterLab with the jupyterlab-dash
extension installed?

You can install the extension with:

$ jupyter labextension install jupyterlab-dash

Then trying to re-install the package in a specif folder:

Building jupyterlab assets (build:prod:minimize)
An error occured.
RuntimeError: JupyterLab failed to build
See the log file for details:

[zerualem]

I am facing a similar issue when trying to install jupyterlab/toc

[foxjr]

Have you tried jupyter labextension install --minimize=False <labextension>?

[dhimmel]

I am facing a similar issue when trying to install jupyterlab/toc

We hit a similar issue and @ravwojdyla figured out that it was due to node running out of memory by looking at the log and seeing SIGKILL. The solution was to increase the node memory limit like

NODE_OPTIONS=--max_old_space_size=4096 jupyter labextension install @jupyterlab/toc

Not sure if that helps.