Jitsi Meet Build

Hi,

I was trying to build Jitsi Meet but ended up following. After build the css/all.css file is empty.

./node_modules/.bin/node-sass css/main.scss css/all.bundle.css &&
./node_modules/.bin/cleancss css/all.bundle.css > css/all.css ;
rm css/all.bundle.css
Rendering Complete, saving .css file…
Wrote CSS to /home/amit/WorkSpace/AndroidProjects/coralmeetings/css/all.bundle.css
/bin/sh: 2: ./node_modules/.bin/cleancss: not found
([ ! -x deploy-local.sh ] || ./deploy-local.sh)
rm -fr build.

Help me.