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

->check what’s running on port 8080 or what ever port u want to check

lsof -i @localhost:8080

if something is running u can close it or use some kill command to close it