Error git server ojs3

I’m trying to help with the rest of the translation of the files in pt_BR via GIT, but this one appears this error:

npm ERR! Linux 4.15.0-34-generic
npm ERR! argv “/usr/bin/nodejs” “/usr/bin/npm” “run” “build”
npm ERR! node v4.2.6
npm ERR! npm v3.5.2
npm ERR! OJS3@3.2.0 build: cross-env NODE_ENV=production webpack --progress --hide-modules
npm ERR! Exit status 2
npm ERR!
npm ERR! Failed at the OJS3@3.2.0 build script ‘cross-env NODE_ENV=production webpack --progress --hide-modules’.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the OJS3 package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! cross-env NODE_ENV=production webpack --progress --hide-modules
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs OJS3
npm ERR! Or if that isn’t available, you can get their info via:
npm ERR! npm owner ls OJS3
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request: