Turbopack Error: Failed to write app endpoint /sign-in/page

[TamaraStoimenovska]

Turbopack version: b1a04a84
Next.js version: 0.0.0

Error message:

Failed to write app endpoint /sign-in/page

Caused by:
- [project]/app/globals.css [app-client] (css)
- reading file C:\Users\User\Desktop\nextjs-inventory-management-app\app\sign-in
- Access is denied. (os error 5)

Debug info:
- Execution of get_written_endpoint_with_issues_operation failed
- Execution of endpoint_write_to_disk failed
- Execution of <AppEndpoint as Endpoint>::output failed
- Failed to write app endpoint /sign-in/page
- Execution of AppEndpoint::output failed
- Execution of AppProject::app_module_graphs failed
- Execution of *<AppEndpoint as Endpoint>::additional_entries failed
- Execution of *ModuleGraph::from_graphs failed
- Execution of SingleModuleGraph::new_with_entries_visited_intern failed
- [project]/app/globals.css [app-client] (css)
- Execution of primary_chunkable_referenced_modules failed
- Execution of <CssModuleAsset as Module>::references failed
- Execution of parse_css failed
- Execution of <PostCssTransformedAsset as Asset>::content failed
- Execution of PostCssTransformedAsset::process failed
- Execution of evaluate_webpack_loader failed
- Execution of <DiskFileSystem as FileSystem>::read failed
- reading file C:\Users\User\Desktop\nextjs-inventory-management-app\app\sign-in
- Access is denied. (os error 5)

[anntnzrb]

The "Access is denied (os error 5)" when reading app\sign-in (no extension) suggests a file/folder naming conflict. Check that:

1. You only have app/sign-in/page.tsx as a directory structure (not a file named sign-in without extension)
2. No duplicate sign-in file exists alongside the folder

Delete .next cache and restart the dev server after fixing.