Edit

\insteon\node_modules\harmonyhubjs-client\node_modules\node-xmpp-client\node_modules\node-xmpp-core\lib\StreamParser.js

, LtxParser = require('ltx/lib/parsers/node-expat')

then go to insteon\node_modules\harmonyhubjs-client\node_modules\node-xmpp-client\node_modules\node-xmpp-core

and npm install node-expat