# Jlpm build fails; vega5 extension

**URL:** <https://discourse.jupyter.org/t/jlpm-build-fails-vega5-extension/1733>\
**Category:** JupyterLab\
**Tags:** community\
**Created:** [July 19, 2019, 6:28pm UTC](https://discourse.jupyter.org/t/jlpm-build-fails-vega5-extension/1733 "2019-07-19T18:28:15Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![scelmore1](https://avatars.discourse-cdn.com/v4/letter/s/73ab20/32.png) [@scelmore1](https://discourse.jupyter.org/u/scelmore1)\
**Post date:** [July 19, 2019, 6:28pm UTC](https://discourse.jupyter.org/t/jlpm-build-fails-vega5-extension/1733/1 "2019-07-19T18:28:15Z")

</div>

`Anaconda3\share\jupyter\lab\staging>jlpm build`

returns

```
yarn run v1.15.2
$ webpack
C:\Users\Scott\Anaconda3\share\jupyter\lab\staging\node_modules\webpack-cli\bin\cli.js:93
                                throw err;
                                ^

Error: Cannot find module '@jupyterlab\vega5-extension\package.json'
```