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# FATAL: An unexpected Turbopack error occurred.

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Connectamitsahoo (@connectamitsahoo) · 2025-12-19

I’m facing a Turbopack internal error during build on Vercel.

Error message

```
Dependency tracking is disabled so invalidation is not allowed
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
FATAL: An unexpected Turbopack error occurred:
Dependency tracking is disabled so invalidation is not allowed at /build/turbopack/crates/turbo-tasks-backend/src/backend/mod.rs:1523:13
thread 'tokio-runtime-worker' (151) panicked at /build/turbopack/crates/turbo-tasks-backend/src/backend/mod.rs:1523:13:
Dependency tracking is disabled so invalidation is not allowed
> Build error occurred
Error [TurbopackInternalError]: Dependency tracking is disabled so invalidation is not allowed at /build/turbopack/crates/turbo-tasks-backend/src/backend/mod.rs:1523:13
    at <unknown> (TurbopackInternalError: Dependency tracking is disabled so invalidation is not allowed at /build/turbopack/crates/turbo-tasks-backend/src/backend/mod.rs:1523:13) {
  type: 'TurbopackInternalError',
  location: '/build/turbopack/crates/turbo-tasks-backend/src/backend/mod.rs:1523:13'
}
Error: Command "npm run build" exited with 1
```

Any guidance would be really helpful. Thanks in advance!