#Error occurred prerendering page "/auth".

1 messages · Page 1 of 1 (latest)

untold stump
#

am getting this error while deploying the project, build while am building the project locally am not getting any error.

www:build:     at nX (/vercel/path0/apps/www/node_modules/next/dist/compiled/next-server/app-page.runtime.prod.js:76:69876)
www:build:     at nW (/vercel/path0/apps/www/node_modules/next/dist/compiled/next-server/app-page.runtime.prod.js:76:68029)
www:build:     at nz (/vercel/path0/apps/www/node_modules/next/dist/compiled/next-server/app-page.runtime.prod.js:76:65337)
www:build: Export encountered an error on /(public)/auth/page: /auth, exiting the build.
www:build:  ⨯ Next.js build worker exited with code: 1 and signal: null
www:build: error: script "build" exited with code 1
www:build: ERROR: command finished with error: command (/vercel/path0/apps/www) /bun1/bun run build exited (1)
www#build: command (/vercel/path0/apps/www) /bun1/bun run build exited (1)
  Tasks:    3 successful, 4 total
 Cached:    2 cached, 4 total
   Time:    54.758s 
Summary:    /vercel/path0/.turbo/runs/2zbCCP5vwTsGZbY64K5VqhIj1Gx.json
 Failed:    www#build
 ERROR  run failed: command  exited (1)
Error: Command "turbo run build" exited with 1
steady fiberBOT
#

Hi @untold stump. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

#

The error you're encountering, "Error occurred prerendering page '/auth'", during deployment on Vercel but not locally, is a common issue with Next.js projects. Based on the knowledge sources, here are the most likely causes and solutions:

1. Missing or Misconfigured Environment Variables

A frequent cause for build errors that only appear on Vercel (and not locally) is missing environment variables. For example, if you are using authentication libraries like next-auth or services like Supabase, you must ensure all required environment variables are set in your Vercel project settings. Local builds may work because your .env.local is present, but Vercel requires these variables to be set in its dashboard.

What to do:

  • Go to your project on Vercel.
  • Navigate to Settings > Environment Variables.
  • Add all necessary variables (e.g., NEXTAUTH_URL, Supabase keys, etc.).
  • Prefer using a .env file rather than .env.local for Vercel, as some users have reported that Vercel may not pick up .env.local during build. Try moving your variables to .env if you haven't already.
  • Redeploy your project after setting the variables.

References:

  • "What worked for me was using my .env file instead of .env.local... Now it builds fine."
  • "I faced this while using next-auth and not providing NEXTAUTH_URL env. Local build was working fine, but the Vercel cloud build was failing. Resolved after setting this environment variable."
  • "Your project's URL and API key are required to create a Supabase client! Export encountered an error..."
    Error occurred prerendering page "/_not-found" with pageExtensions option

2. Differences in Node.js or Package Versions

#

Sometimes, the Node.js version or package versions used on Vercel differ from your local environment, leading to build errors.

What to do:

  • Check the Node.js version used locally and on Vercel. You can specify the Node.js version in your package.json or via the Vercel dashboard.
  • Ensure your dependencies are up to date and consistent between local and remote environments.

3. Code That Depends on Server-Only or Client-Only Features

If your /auth page uses code that expects certain environment variables or APIs only available in one environment, it may fail during static generation or SSR on Vercel.

What to do:

  • Review your /auth page for any code that accesses environment variables or APIs and ensure they are available during the build.
  • If you use dynamic imports or client-only libraries, ensure they are properly wrapped (e.g., with "use client" or dynamic imports with ssr: false).

4. Debugging Further

  • Check the Vercel build logs for more detailed error messages.
  • Try building your project locally with the same environment variables as on Vercel to reproduce the error.

For more on troubleshooting Vercel build errors, see the official docs: Troubleshooting Build Errors.

Summary:
The most common cause is missing environment variables on Vercel. Double-check your Vercel environment settings and ensure all required variables are present in a .env file. If the issue persists, review your code for environment-specific logic and check for version mismatches between local and Vercel environments.

#

If you need more specific help, please provide the exact error message from the Vercel build logs and details about any authentication or third-party services used in your /auth page.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: