ExpressJS - throw er Unhandled error event

Question

I created expressjs application using the following commands:

express -e folderName
npm install ejs --save
npm install

When I run the appli

Answer 1

I fixed the bug by changing the port which was

app.set('port', process.env.PORT || 3000);

and changed to:

app.set('port', process.env.PORT || 8080);