npm run startで起こるエラー

Question

Error: Could not find a production build in the '/Users/**/.next' directory. Try building your app with 'next build' before starting the production server. https://nextjs.org/docs/messages/production-start-no-build-id
    at Server.readBuildId (/Users/**/node_modules/next/dist/next-server/server/next-server.js:150:355)
    at new Server (/Users/**/node_modules/next/dist/next-server/server/next-server.js:3:120)
    at NextServer.createServer (/Users/**/node_modules/next/dist/server/next.js:1:2935)
    at async /Users/**/node_modules/next/dist/server/next.js:1:3360
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! with-typescript@1.0.0 start: `next start`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the with-typescript@1.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/**/.npm/_logs/2021-05-01T09_17_29_090Z-debug.log

Answer 1

> npm run build
> npm run start