My node.js webapp (with bootsrap) works locally but not on my express server

I’m trying to develop a real estate web app. I downloaded html/css theme from envato and they look great locally… not so much on my express server (running on my host machine).

I get this error

As soon as I take out

"var bootstrap = require('bootstrap');"

my website loads but Website layout is off. Anyone else experience this problem before?