TypeError: Cannot read property 'length' of undefined

[jakobrosenberg]

Red screen with the mentioned error after running the following.

yarn install
yarn dev

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[pi0]

yarn run v1.3.2
error Couldn't find a package.json file in "/Users/pooya"
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

I just edited this file on github

<script>window.alert('YEAH!')</script>

[benjamincanac]

Thanks @pi0 !