Next.js: npm run build success but got an error when I run next start

[zigxas]

I execute npm run build success but got an error message

> Could not find a valid build in the '.next' directory! Try building your app with 'next build' before starting the server.

I try removing node_module and reinstall them but still got an error.

[lfades]

is your script build in package.json actually doing next build ?

[zigxas]

yes
"scripts": {
"dev": "node server.js",
"build": "next build",
"start": "next start -p 80 server.js",
"start2": "next start server.js"
},

[lfades]

remove the .next folder and try again

[zigxas]

not work.

[zigxas]

I found this https://github.com/arunoda/next.js/blob/6d0511b96ab4d32b09879ecff53fa46e18f93fb1/bin/next-start

if (!existsSync(resolve(dir, '.next', 'build-stats.json'))) {
console.error(> Could not find a valid build in the '.next' directory! Try building your app with 'next build' before starting the server.)
process.exit(1)
}

[lfades]

Mmmm, try not to use next start in the script start and use NODE_ENV=production server.js instead

[zigxas]

Wow thanks it works !

[dbkaplun]

I have the same issue, next build works fine but next start fails. No custom server. next build doesn't seem to create a build-stats.json when I run it.

[lfades]

@dbkaplun can you share a repo ?

[dbkaplun]

Here's the repo: https://github.com/dbkaplun/dbkaplun

UPDATE: glitch has since been fixed, but I'm not sure how.

[lfades]

your project worked very well with me

with next 3.0.1-beta.17 - node 8.0.0 - npm 5.4.2
Maybe you have a lower version of node ?

btw nice canvas :D

[boriswexler]

@dbkaplun I am having the same issue - how did you resolve yours? I checked your repo and can't find the glitch.

[khrome83]

I can confirm i am seeing this, when I run next in development mode

[khrome83]

Deleting .next folder and restarting dev server fixed the problem.
I am using nodemon to run next in dev mode after using babel-register. So I am guessing something go out of wack.

[khrome83]

Another updated, it fixed the issue briefly. Now it started doing it all over again.

[MiguelCedric]

Try running npm run build then run npm start again it should work

[faeghe-hajiabadi]

thanks @MiguelCedric . worked for me

[PiyankaYadav]

@lfades could you please tell me that what these are doing:
"dev": "node server.js",
"build": "next build",
"start": "NODE_ENV=production node server.js"
I just started with next.js and I want to know wy thses are used.

[lfades]

@PiyankaYadav When you're using a custom server next start will not start your server, therefore you need to use node and start Next.js inside your node server.

Side note: Don't use a custom server if you're not 110% sure that you need one.