Upfront Builder WSOD on WAMP

Upfront Builder is causing White Screen of Death. WP and plugins were recently updated so they are in the newest versions. Cache was cleared too.

There's an error in the console:

Uncaught ReferenceError: upfrontrjs is not defined
at HTMLDocument.<anonymous> (secgo:319)
at HTMLDocument.dispatch (jquery.js:3)
at HTMLDocument.r.handle (jquery.js:3)
at Object.trigger (jquery.js:3)
at Object.a.event.trigger (jquery-migrate.min.js:2)
at HTMLDocument.<anonymous> (jquery.js:3)
at Function.each (jquery.js:2)
at a.fn.init.each (jquery.js:2)
at a.fn.init.trigger (jquery.js:3)
at N.n.boot (main.js:118)

The site is set on WAMP (local site).