Getting error in dev server

[HarshThink]

$ npm run start

riode-react@2.0.0 start
next start

ready - started server on 0.0.0.0:3000, url: http://localhost:3000
info - Loaded env from D:\riode-nextjs\react-nextjs-riode.env.production
info - Using webpack 5. Reason: no custom webpack configuration in next.config.js https://nextjs.org/docs/messages/webpack5
Error: Specified basePath /. basePath has to be either an empty string or a path prefix"
at assignDefaults (D:\riode-nextjs\react-nextjs-riode\node_modules\next\dist\next-server\server\config.js:5:1391)
at loadConfig (D:\riode-nextjs\react-nextjs-riode\node_modules\next\dist\next-server\server\config.js:8:878)
at async NextServer.loadConfig (D:\riode-nextjs\react-nextjs-riode\node_modules\next\dist\server\next.js:1:3155)
at async NextServer.prepare (D:\riode-nextjs\react-nextjs-riode\node_modules\next\dist\server\next.js:1:2679)
at async D:\riode-nextjs\react-nextjs-riode\node_modules\next\dist\cli\next-start.js:19:331

Got above error and After that i changed my next.config.js file basePath to this, basePath: "", but still not working, below is the error after modification in next config file.

npm run start

riode-react@2.0.0 start
next start

ready - started server on 0.0.0.0:3000, url: http://localhost:3000
info - Loaded env from D:\riode-nextjs\react-nextjs-riode.env.production
info - Using webpack 5. Reason: no custom webpack configuration in next.config.js https://nextjs.org/docs/messages/webpack5
Error: Could not find a production build in the 'D:\riode-nextjs\react-nextjs-riode\build' 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 (D:\riode-nextjs\react-nextjs-riode\node_modules\next\dist\next-server\server\next-server.js:151:355)
at new Server (D:\riode-nextjs\react-nextjs-riode\node_modules\next\dist\next-server\server\next-server.js:3:120)
at NextServer.createServer (D:\riode-nextjs\react-nextjs-riode\node_modules\next\dist\server\next.js:1:2935)
at async D:\riode-nextjs\react-nextjs-riode\node_modules\next\dist\server\next.js:1:3360