If any other app or process is running on port 3000, you will get this error in your terminal
Port 3000 is already in use.
error Command failed with exit code 1.
Solutions
To set it inside your package.json's script section.
"scripts": {
"dev": "next -p 3040", // This will change it for dev environment
"build": "next build",
"start": "next start -p 3040" // This will change it for the production
}
