variable　inspectorの拡張機能がうまくDLできない

現在、Jupyterにて拡張機能[variable　inspector]をダウンロードしようとしたのですが
下記のエラーが表示されます。

jupyter lab を起動したら

Build Failed
Build failed with 500, please run 'jupyter lab build' on the server for full output

Dismiss

とポップが表示されます。

ターミナル内で
conda -V
conda 4.10.1
node -v
v14.8.0
jupyter labextension install @lckr/jupyterlab_variableinspector

とすると

[W 2021-06-04 14:15:22.566 LabApp] Build failed, running a clean and rebuild
[I 2021-06-04 14:15:22.583 LabApp] Cleaning /Users/ユーザー名/opt/anaconda3/envs/開発環境/share/jupyter/lab...
[W 2021-06-04 14:15:22.585 ServerApp] 500 POST /lab/api/build?1622783666927 (::1): 'AppOptions' object has no attribute 'extensions'
[W 2021-06-04 14:15:22.585 LabApp] 'AppOptions' object has no attribute 'extensions'
[E 2021-06-04 14:15:22.588 LabApp] {
"Host": "localhost:8891",
"Pragma": "no-cache",
"Accept": "/",
"Authorization": "token 5296eceb0414f918c871bfe67a16c3360d66821759107198",
"X-Xsrftoken": "2|a59e9025|5c8ba339586c5f92d769c65e13658f5e|1622633291",
"Accept-Language": "ja-jp",
"Accept-Encoding": "gzip, deflate",
"Cache-Control": "no-cache",
"Content-Type": "application/json",
"Origin": "http://localhost:8891",
"User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Safari/605.1.15",
"Referer": "http://localhost:8891/lab",
"Content-Length": "0",
"Connection": "keep-alive",
"Cookie": "username-localhost-8891="2|1:0|10:1622783665|23:username-localhost-8891|44:OGI3YWU2MGVkMTQ0NDllOTg4ZmYxMGI2OWFlNzM2YWU=|e08dca9363c752016c825bbc7ca233cdcb6dcdfeb078dcad63157e7c453ef363"; username-localhost-8890="2|1:0|10:1622781323|23:username-localhost-8890|44:NGU2M2E2OGQ4M2I1NDc3N2IyZjdmNjc5YTNjNmY4MGI=|899e79cf9eb56e42f9e2d6ca6d881b0687b32aee0158726f1a98d6033b4641c5"; username-localhost-8889="2|1:0|10:1622734064|23:username-localhost-8889|44:YjUwNmJjYWEyN2NkNDZhZDhhODFiYmNiMDY4ZGMzODc=|448357ebfb0c87aa5bc8abee7aa5cff66ef8bae58255f558164e1782c81d05bf"; _xsrf=2|a59e9025|5c8ba339586c5f92d769c65e13658f5e|1622633291"
}
**[E 2021-06-04 14:15:22.588 LabApp] 500 POST /lab/api/build?1622783666927 (::1) 55657.79ms referer=http://localhost:8891/lab
**

と表示され、次に　　% jupyter lab build を実行

[LabBuildApp] JupyterLab 3.0.14
[LabBuildApp] Building in /Users/ogurahidehito/opt/anaconda3/envs/hide-02/share/jupyter/lab
[LabBuildApp] Building jupyterlab assets (production, minimized)
**Build failed.
**Troubleshooting: If the build failed due to an out-of-memory error, you
may be able to fix it by disabling the dev_build and/or minimize options.

If you are building via the jupyter lab build command, you can disable
these options like so:

jupyter lab build --dev-build=False --minimize=False

You can also disable these options for all JupyterLab builds by adding these
lines to a Jupyter config file named jupyter_config.py:

c.LabBuildApp.minimize = False
c.LabBuildApp.dev_build = False

If you don't already have a jupyter_config.py file, you can create one by
adding a blank file of that name to any of the Jupyter config directories.
The config directories can be listed by running:

jupyter** --paths**

Explanation:

dev-build: This option controls whether a dev or a more streamlined

production build is used. This option will default to False (i.e., the
production build) for most users. However, if you have any labextensions

installed from local files, this option will instead default to True.
Explicitly setting dev-build to False will ensure that the production
build is used in all circumstances.

minimize: This option controls whether your JS bundle is minified

during the Webpack build, which helps to improve JupyterLab's overall
performance. However, the minifier plugin used by Webpack is very memory
intensive, so turning it off may help the build finish successfully in
low-memory environments.

An error occured.
RuntimeError: JupyterLab failed to build
See the log file for details: /var/folders/g5/nsg51g851m3__53jy24nhh1c0000gn/T/jupyterlab-debug-8cv0i5ao.log

**おそらく、pass--が通っていないのか、build が関係していると思うのですが、原因がわからず質問させていただきました。
**