What this error means

Turbopack build fails 'Failed to collect page data' on CMS-fed sitemap.xml is a Vercel / Next.js failure pattern reported for developers trying to fix next.js turbopack build failure specifically affecting cms-driven sites generating dynamic sitemaps — common pattern for marketing/content businesses deploying on vercel. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

Found in vercel/next.js GitHub Issues #93144 (opened Apr 23, 2026). Labeled as Turbopack. Turbopack vs webpack behavior divergence affects enterprise deployments. Content-management driven sites represent significant commercial use cases on Vercel.

Common causes

  • Found in vercel/next.js GitHub Issues #93144 (opened Apr 23, 2026). Labeled as Turbopack. Turbopack vs webpack behavior divergence affects enterprise deployments. Content-management driven sites represent significant commercial use cases on Vercel.

Quick fixes

  1. Confirm the exact error signature matches Turbopack build fails 'Failed to collect page data' on CMS-fed sitemap.xml.
  2. Check the Vercel / Next.js account, local tool state, and provider configuration involved in the failing workflow.
  3. Check the build output, project root, and deployment platform configuration before redeploying.

Platform/tool-specific checks

  • Verify the command, editor, extension, or API client that produced the error.
  • Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
  • Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

  1. Capture the exact error message and the command, editor action, or request that triggered it.
  2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
  3. Review the source evidence below and compare it with your environment.
  4. Apply one change at a time and rerun the smallest failing action.
  5. Keep the working fix documented for the team or deployment environment.

How to prevent it

  • Keep provider/tool configuration documented.
  • Record non-secret diagnostics such as tool version, provider name, model name, and command path.
  • Add a lightweight check before CI or production workflows depend on the tool.