Try reinstalling `node-sass` on node 


Error encountered when running npm problem: Error: `libsass` bindings not found. Try reinstalling `node-sass`?

Solution:
1. Try rebuild the node-sass:
npm rebuild node-sass
2. Try reinstall gulp-sass if you are using node.js 4.x:
npm uninstall --save-dev gulp-sass

npm install --save-dev gulp-sass@2

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