Turbopack Error: Failed to write app endpoint /page

[shakib-mia]

Turbopack version: d1bd5b58
Next.js version: 0.0.0

Error message:

Failed to write app endpoint /page

Caused by:
- Next.js package not found

Debug info:
- Execution of Project::hmr_version_state failed
- Execution of Project::hmr_version failed
- Execution of VersionedContentMap::get failed
- Execution of VersionedContentMap::get_asset failed
- Execution of VersionedContentMap::compute_entry failed
- Execution of *emit_assets failed
- Execution of all_assets_from_entries_operation failed
- Execution of *all_assets_from_entries failed
- Execution of endpoint_output_assets_operation failed
- Execution of <AppEndpoint as Endpoint>::output failed
- Failed to write app endpoint /page
- Execution of AppEndpoint::output failed
- Execution of AppEndpoint::app_page_entry failed
- Execution of *get_app_page_entry failed
- Execution of AppProject::rsc_module_context failed
- Execution of *ModuleAssetContext::new failed
- Execution of *AppProject::get_rsc_transitions failed
- Execution of AppProject::ecmascript_client_reference_transition failed
- Execution of *NextEcmascriptClientReferenceTransition::new failed
- Execution of AppProject::ssr_transition failed
- Execution of *FullContextTransition::new failed
- Execution of AppProject::ssr_module_context failed
- Execution of AppProject::shared_transition failed
- Execution of *FullContextTransition::new failed
- Execution of AppProject::shared_module_context failed
- Execution of *ModuleAssetContext::new failed
- Execution of get_server_resolve_options_context failed
- Execution of get_next_server_import_map failed
- Next.js package not found

[LienThuan04]

The Next.js version: 0.0.0 is the smoking gun — Turbopack can't locate the Next.js package in your project.

Fix in order:

1. Delete and reinstall:
   rm -rf node_modules .next
   npm install # or pnpm install / yarn

2. If that doesn't work, verify Next.js is actually installed:
   npm ls next
   If it shows (empty) or an error, install it explicitly:
   npm install next

3. Make sure you're running from the correct directory.
   The error often happens when you run next dev from a parent Next.js project folder.

4. If you're using a monorepo (Turborepo, pnpm workspaces):

Turbopack looks for next relative to the app package, not the workspace root. Ensure next is in the dependencies of the specific app's package.json, not only the root:
// apps/web/package.json

"dependencies": {
"next": "^14.0.0"
}
}

Root cause: Turbopack resolves the Next.js package at startle graph. If the package is missing, mislinked, or in thewrong location, it throws Next.js package not found before any compilation begins.

[eben-vranken]

Most likely broken or missing node_modules. Try a clean reinstall:

rm -rf node_modules .next
npm install   # or pnpm install / yarn